zulip/docs/overview/changelog.md

# Version History

All notable changes to the Zulip server are documented in this file.

### Unreleased

This section lists notable unreleased changes; it is generally updated
in bursts.

**Highlights:**
- Added support for custom profile fields.
- Added support for Debian stretch and Ubuntu bionic.
- Added support for using Google Hangouts as the video chat provider.
- Added support for configuring a private stream so subscribers can
  access full history, even before they joined the stream.
- Added support for announcement-only streams.

**Full feature changelog:**
- Added an organization setting for message deletion time limits.
- Added an organization setting to control who can edit topics.
- Added ctrl+K keyboard shortcut for getting to search (same as /, but
  works even when you're inside compose).
- Optimized the performance of loading Zulip in an organization with
  thousands of users and hundreds of bot users.
- Removed the "Delete streams" administration page; one can delete
  streams directly on "Manage streams".
- Removed support code for the (long-deprecated) legacy desktop app.
- Fixed several bugs with progress bars when uploading files.
- Fixed several bugs in `manage.py register_server`.
- Fixed several minor real-time sync issues with stream settings.
- Fixed some tricky corner cases with the webapp's caching model and
narrowing to the first unread message.
- Fixed confusing intermediate states of group PMs online indicators.
- Fixed several subtle unread count corner case bugs.
- Fixed several installer issues to make it easier to Dockerize Zulip.
- Fixed several minor bugs with search typeahead.
- Rewrote user documentation for dozens of integrations.
- Upgraded to modern versions of most of our stale dependencies.
- Updated our CSS toolchain to support hot module reloading.
- Updated numerous pages within the /help/ site.
- We no longer require re-authing to signup after trying to login with
  an OAuth authentication backend (GitHub or Google).
- Improved system for configuring the S3 file uploads backend.
- Improved emoji typeahead sorting.
- Improved Zulip's layout for windows with a width around 1024px.
- Improved Zulip's generic error handling behavior for webhooks.
- Converted several layered-checkbox settings to clearer dropdowns.
- Cleaned up some legacy APIs still using email addresses.
- Made arrow-key navigation work within right and left sidebar search.
- Fixed performance issues of the right sidebar user list with 5000+
  user accounts on a server.
- Emails and other onboarding strings are now tagged for translation.
- Backend test coverage is now 97%.

### 1.8.1 -- 2018-05-07

- Added an automated tool (`manage.py register_server`) to sign up for
  the [mobile push notifications service](../production/mobile-push-notifications.html).
- Improved rendering of block quotes in mobile push notifications.
- Improved some installer error messages.
- Fixed several minor bugs with the new Slack import feature.
- Fixed several visual bugs with the new compose input pills.
- Fixed several minor visual bugs with night mode.
- Fixed bug with visual clipping of "g" in the left sidebar.
- Fixed an issue with the LDAP backend users' Organization Unit (OU)
  being cached, resulting in trouble logging in after a user was moved
  between OUs.
- Fixed a couple subtle bugs with muting.

### 1.8.0 -- 2018-04-17

**Highlights:**
- Dramatically simplified the server installation process; it's now possible
  to install Zulip without first setting up outgoing email.
- Added experimental support for importing an organization's history
  from Slack.
- Added a new "night mode" theme for dark environments.
- Added a video call integration powered by Jitsi.
- Lots of visual polish improvements.
- Countless small bugfixes both in the backend and the UI.


**Security and privacy:**
- Several important security fixes since 1.7.0, which were released
  already in 1.7.1 and 1.7.2.
- The security model for private streams has changed.  Now
  organization administrators can remove users, edit descriptions, and
  rename private streams they are not subscribed to.  See Zulip's
  security model documentation for details.
- On Xenial, the local uploads backend now does the same security
  checks that the S3 backend did before serving files to users.
  Ubuntu Trusty's version of nginx is too old to support this and so
  the legacy model is the default; we recommend upgrading.
- Added an organization setting to limit creation of bots.
- Refactored the authentication backends codebase to be much easier to
  verify.
- Added a user setting to control whether email notifications include
  message content (or just the fact that there are new messages).


**Visual and UI:**
- Added a user setting to translate emoticons/smileys to emoji.
- Added a user setting to choose the emoji set used in Zulip: Google,
  Twitter, Apple, or Emoji One.
- Expanded setting for displaying emoji as text to cover all display
  settings (previously only affected reactions).
- Overhauled our settings system to eliminate the old "save changes"
  button system.
- Redesigned the "uploaded files" UI.
- Redesigned the "account settings" UI.
- Redesigned error pages for the various email confirmation flows.
- Our emoji now display at full resolution on retina displays.
- Improved placement of text when inserting emoji via picker.
- Improved the descriptions and UI for many settings.
- Improved visual design of the help center (/help/).


**Core chat experience:**
- Added support for mentioning groups of users.
- Added a setting to allow users to delete their messages.
- Added support for uploading files in the message-edit UI.
- Redesigned the compose are for private messages to use pretty pills
  rather than raw email addresses to display recipients.
- Added new ctrl+B, ctrl+I, ctrl+L compose shortcuts for inserting
  common syntax.
- Added warning when linking to a private stream via typeahead.
- Added support for automatically-numbered markdown lists.
- Added a big warning when posting to #announce.
- Added a notification when drafts are saved, to make them more
  discoverable.
- Added a fast local echo to emoji reactions.
- Messages containing just a link to an image (or an uploaded image)
  now don't clutter the feed with the URL: we just display the image.
- Redesigned the API for emoji reactions to support the full range of
  how emoji reactions are used.
- Fixed most of the known (mostly obscure) bugs in how messages are
  formatted in Zulip.
- Fixed "more topics" to correctly display all historical topics for
  public streams, even though from before a user subscribed.
- Added a menu item to mark all messages as read.
- Fixed image upload file pickers offering non-image files.
- Fixed some subtle bugs with full-text search and unicode.
- Fixed bugs in the "edit history" HTML rendering process.
- Fixed popovers being closed when new messages come in.
- Fixed unexpected code blocks when using the email mirror.
- Fixed clicking on links to a narrow opening a new window.
- Fixed several subtle bugs with the email gateway system.
- Fixed layering issues with mobile Safari.
- Fixed several obscure real-time synchronization bugs.
- Fixed handling of messages with a very large HTML rendering.
- Fixed several bugs around interacting with deactivated users.
- Fixed interaction bugs with unread counts and deleting messages.
- Fixed support for replacing deactivated custom emoji.
- Fixed scrolling downwards in narrows.
- Optimized how user avatar URLs are transmitted over the wire.
- Optimized message sending performance a bit more.
- Fixed a subtle and hard-to-reproduce bug that resulted in every
  message being condensed ([More] appearing on every message).
- Improved typeahead's handling of editing an already-completed mention.
- Improved syntax for inline LaTeX to be more convenient.
- Improved syntax for permanent links to streams in Zulip.
- Improved behavior of copy-pasting a large number of messages.
- Improved handling of browser undo in compose.
- Improved saved drafts system to garbage-collect old drafts and sort
  by last modification, not creation.
- Removed the legacy "Zulip labs" autoscroll_forever setting.  It was
  enabled mostly by accident.
- Removed some long-deprecated markdown syntax for mentions.
- Added support for clicking on a mention to see a user's profile.
- Links to logged-in content in Zulip now take the user to the
  appropriate upload or view after a user logs in.
- Renamed "Home" to "All messages", to avoid users clicking on it too
  early in using Zulip.
- Added a user setting to control whether the organization's name is
  included in email subject lines.
- Fixed uploading user avatars encoded using the CMYK mode.


**User accounts and invites:**
- Added support for users in multiple realms having the same email.
- Added a display for whether the user is logged-in in logged-out
  pages.
- Added support for inviting a new user as an administrator.
- Added a new organization settings page for managing invites.
- Added rate-limiting on inviting users to join a realm (prevents spam).
- Added an organization setting to disable welcome emails to new users.
- Added an organization setting to ban disposable email addresses
  (I.e.. those from sites like mailinator.com).
- Improved the password reset flow to be less confusing if you don't
  have an account.
- Split the Notifications Stream setting in two settings, one for new
  users, the other for new streams.


**Stream subscriptions and settings:**
- Added traffic statistics (messages/week) to the "Manage streams" UI.
- Fixed numerous issues in the "stream settings" UI.
- Fixed numerous subtle bugs with the stream creation UI.
- Changes the URL scheme for stream narrows to encode the stream ID,
  so that they can be robust to streams being renamed.  The change is
  backwards-compatible; existing narrow URLs still work.


**API, bots, and integrations:**
- Rewrote our API documentation to be much more friendly and
  expansive; it now covers most important endpoints, with nice examples.
- New integrations: ErrBot, GoCD, Google Code-In, Opbeat, Groove,
  Raygun, Insping, Dialogflow, Dropbox, Front, Intercom,
  Statuspage.io, Flock and Beeminder.
- Added support for embedded interactive bots.
- Added inline preview + player for Vimeo videos.
- Added new event types and fixed bugs in several webhook integrations.
- Added support for default bots to receive messages when they're
  mentioned, even if they are not subscribed.
- Added support for overriding the topic is all incoming webhook integrations.
- Incoming webhooks now send a private message to the bot owner for
  more convenient testing if a stream is not specified.
- Rewrote documentation for many integrations to use a cleaner
  numbered-list format.
- APIs for fetching messages now provide more metadata to help clients.


**Keyboard shortcuts:**
- Added new "basics" section to keyboard shortcuts documentation.
- Added a new ">" keyboard shortcut for quote-and-reply.
- Added a new "p" keyboard shortcut to jump to next unread PM thread.
- Fixed several hotkeys scope bugs.
- Changed the hotkey for compose-private-message from "C" to "x".
- Improve keyboard navigation of left and right sidebars with arrow keys.


**Mobile apps backend:**
- Added support for logging into the mobile apps with RemoteUserBackend.
- Improved mobile notifications to support narrowing when one clicks a
  mobile push notification.
- Statistics on the fraction of strings that are translated now
  include strings in the mobile apps as well.


**For server admins:**
- Added certbot support to the installer for getting certificates.
- Added support for hosting multiple domains, not all as subdomains of
  the same base domain.
- Added a new nagios check for the Zulip analytics state.
- Fixed buggy APNs logic that could cause extra exception emails.
- Fixed a missing dependency for the localhost_sso auth backend.
- Fixed subtle bugs in garbage-collection of old node_modules versions.
- Clarified instructions for server settings (especially LDAP auth).
- Added missing information on requesting user in many exception emails.
- Improved Tornado retry logic for connecting to RabbitMQ.
- Added a server setting to control whether digest emails are sent.


**For Zulip developers:**
- Migrated the codebase to use the nice Python 3 typing syntax.
- Added a new /team/ page explaining the team, with a nice
  visualization of our contributors.
- Dramatically improved organization of developer docs.
- Backend test coverage is now 95%.


### 1.7.2 -- 2018-04-12

This is a security release, with a handful of cherry-picked changes
since 1.7.1.  All Zulip server admins are encouraged to upgrade
promptly.

- CVE-2018-9986: Fix XSS issues with frontend markdown processor.
- CVE-2018-9987: Fix XSS issue with muting notifications.
- CVE-2018-9990: Fix XSS issue with stream names in topic typeahead.
- CVE-2018-9999: Fix XSS issue with user uploads.  The fix for this
  adds a Content-Security-Policy for the `LOCAL_UPLOADS_DIR` storage
  backend for user-uploaded files.

Thanks to Suhas Sunil Gaikwad for reporting CVE-2018-9987 and w2w for
reporting CVE-2018-9986 and CVE-2018-9990.

### 1.7.1 -- 2017-11-21

This is a security release, with a handful of cherry-picked changes
since 1.7.0.  All Zulip server admins are encouraged to upgrade
promptly.

This release includes fixes for the upgrade process, so server admins
running a version from before 1.7 should upgrade directly to 1.7.1.

- CVE-2017-0910: On a server with multiple realms, a vulnerability in
  the invitation system allowed an authorized user of one realm to
  create an account on any other realm.
- The Korean translation is now complete, a huge advance from almost
  nothing in 1.7.0.  The French translation is now nearly complete,
  and several other languages have smaller updates.
- The installer now sets LC_ALL to a known locale, working around an
  issue where some dependencies fail to install in some locales.
- We fixed a bug in the script that runs after upgrading Zulip (so
  the fix applies when upgrading to this version), where the
  garbage-collection of old deployments sometimes wouldn't preserve
  the immediate last deployment.

### 1.7.0 -- 2017-10-25

**Highlights:**

Web
- We’ve completely redesigned our onboarding process to explain Zulip,
  and especially topics, to new users.
- We’ve built a beautiful new emoji picker with categories, a
  showcase, and much better data. Note the clean, underscore-free
  display!
- The emails sent by Zulip are more consistent, readable, and visually
  interesting.
- Chinese (Simplified) and Japanese join Spanish, German, and Czech in
  having the user interface fully translated, in addition to partial
  translations for many other languages. We also fixed many small
  issues where strings weren’t tagged for translation.
- Many pages have been redesigned to be easier to use and visually
  cleaner, including the settings pages and the user documentation at
  /help, /integrations, and /apps.

Mobile and Desktop support
- Zulip Server 1.7 adds several new APIs that are critical for mobile
  app performance and that let the app track unread messages. If
  you’re using the mobile apps at all (iOS or Android), you will
  definitely want to upgrade to Zulip 1.7.
- The iOS and Android apps can receive push notifications
  (configurable, naturally) for events like PMs and @-mentions. While
  Zulip Server 1.6 has basic support for these, 1.7 brings a new,
  clearer format to notifications, and gives each user more options
  for finer-grained control.
- The new Electron desktop app is out of beta and replaces our legacy
  desktop apps.

Backend and scaling
- Zulip now runs exclusively on Python 3.  This is the culmination of
  an 18-month migration effort.  We are very excited about this!
- We’ve added an automatic "soft deactivation" process, which
  dramatically improves performance for organizations with a large
  number of inactive users, without any impact on those users’
  experience if they later come back.
- Zulip's performance at scale has improved significantly. Performance
  now scales primarily with number of active users (not total
  users). As an example, chat.zulip.org serves 400 monthly active
  users and about 3500 total users, on one VM with just 8GB of RAM and
  a CPU consistently over 90% idle.

**Upgrade notes:**

* Zulip 1.7 contains some significant database migrations that can
  take several minutes to run.  The upgrade process automatically
  minimizes disruption by running these first, before beginning the
  user-facing downtime.  However, if you'd like to watch the downtime
  phase of the upgrade closely, we recommend
  [running them first manually](../production/expensive-migrations.html) and as well
  as the usual trick of
  [doing an apt upgrade first](../production/maintain-secure-upgrade.html#applying-ubuntu-system-updates).

* We've removed support for an uncommon legacy deployment model where
  a Zulip server served multiple organizations on the same domain.
  Installs with multiple organizations now require each organization
  to have its own subdomain.

  This change should have no effect for the vast majority of Zulip
  servers that only have one organization.  If you manage a server
  that hosts multiple organizations, you'll want to read [our guide on
  multiple organizations](../production/multiple-organizations.html).

* We simplified the configuration for our password strength checker to
  be much more intuitive.  If you were using the
  `PASSWORD_MIN_ZXCVBN_QUALITY` setting,
  [it has been replaced](https://github.com/zulip/zulip/commit/a116303604e362796afa54b5d923ea5312b2ea23) by
  the more intuitive `PASSWORD_MIN_GUESSES`.

**Full feature changelog:**

- Simplified the process for installing a new Zulip server, as well as
  fixing the most common roadbumps and confusing error messages.
- Added a new "incoming webhook" bot type, limited to only sending
  messages into Zulip, for better security.
- Added experimental support for outgoing webhooks.
- Added support for changing the notifications stream.
- Added 'u' hotkey to show a user's profile.
- Added '-' hotkey to toggle collapsing a message.
- Added an organization setting to require topics in stream messages.
- Added an organization setting to control whether edit history is available.
- Added a confirmation dialogue when inviting many users to a new stream.
- Added new notification setting to always get push notifications on a stream.
- Added new "getting started" guides to the user documentation.
- Added support for installing a Zulip server from a Git checkout.
- Added support for mentioning a user when editing a message.
- Added OpsGenie, Google Code-In, Google Search, and xkcd integrations.
- Added support for organization administrators deleting private streams.
- Added support for using any LDAP attribute for login username.
- Added support for searching by group-pm-with.
- Added support for mentioning users when editing messages.
- Added a much prettier prompt for enabling desktop notifications.
- Added a new PHYSICAL_ADDRESS setting to be used in outgoing emails
  to support compliance with anti-spam regulations.
- Dramatically improved the search typeahead experience when using
  multiple operators.
- Improved design for /stats page and added a link to it in the gear menu.
- Improved how timestamps are displayed across the product.
- Improved the appearance of mention/compose typeahead.
- Improved lightbox to support panning and zooming on images.
- Improved "more topics" to fetch all historical topics from the server.
- Improved scrollbars across the site to look good on Windows and Linux.
- Improved visual design of stream management UI.
- Improved management of disk space, especially when deploying with
  Git frequently.
- Improve mention typeahead sort order to prioritize recent senders in
  a stream.
- Swapped the 'q' and 'w' hotkeys to better match the UI.
- Fixed most issues with the registration flow, including adding Oauth
  support for mobile and many corner case problems.
- Significantly improved sort ordering for the emoji picker.
- Fixed most accessibility errors detected by major accessibility
  checker tools.
- Extracted Zulip's Python API and bots ecosystem into its own
  repository, zulip/python-zulip-api.
- Enter hotkey now opens compose in empty narrows.
- Significantly improved performance of "starred messages" and
  "mentions" database queries through new indexes.
- Upgraded to Django 1.11.x.
- Upgraded to a more modern version of the SourceSansPro font.
- Redesigned several settings subpages to be visually cleaner.
- Redesigned Zulip's error pages to feature cute illustrations.
- Dramatically improved the user typeahead algorithm to suggest
  relevant users even in large organizations with 1000s of accounts.
- Fixed log rotation structural issues which wasted a lot of disk.
- Updated notification settings to not require a "save changes" button.
- Rewrote the documentation for almost all of our integrations to be
  much clearer and more consistent through use of Markdown and macros.
- Restructured Zulip's management commands to use a common system for
  accessing realms and users.
- Made starting editing a message you just sent not require a round trip.
- Dramatically increased test coverage of the frontend codebase.
- Dramatically improved the responsive mobile user experience.
- Changed the right sidebar search to ignore diacritics.
- Overhauled error handling in the new user registration flows.
- Fixed minor bugs in several webhook integrations.
- Fixed several local echo bugs involving mentions and line-wrapping.
- Fixed various inconsistent old-style buttons in settings pages.
- Fixed some obscure bugs with uploading files.
- Fixed issues with deactivating realm emoji.
- Fixed rendering of emoji in tweet previews.
- Fixed buggy translation caching which filled local storage.
- Fixed handling of desktop and mobile apps in new-login emails.
- Fixed caching of source repository in upgrade-zulip-from-git.
- Fixed numerous minor internationalization bugs.
- Fixed several bugs with the LDAP authentication backend.
- Fixed several corner case bugs with push notification.
- Fixed rendering of realm emoji in missed-message emails.
- Fixed various endpoints incorrectly using the PUT HTTP method.
- Fixed bugs in scrolling up using the home key repeatedly.
- Fixed a bug where private messages from multiple users could be
  included in a single missed-message email.
- Fixed issues with inconsistent visual display of @-all mentions.
- Fixed zombie process leaks on servers with <4GB of RAM.
- Fixed markdown previews of /me messages.
- Fixed a subtle bug involving timestamps of locally echoed messages.
- Fixed the behavior of key combintions like Ctrl+Enter in the compose box.
- Worked around Google Compute Engine's default boto configuration,
  which broke Zulip (and any other app using boto).
- Zulip now will gracefully handle the Postgres server being restarted.
- Optimized marking an entire topic as read.
- Switched from npm to yarn for downloading JS packages.
- Switched the function of the 'q' and 'w' search hotkeys.
- Simplified the settings for configuring senders for our emails.
- Emoji can now be typed with spaces, e.g. entering "robot face" in
  the typeahead as well as "robot_face".
- Improved title and alt text for unicode emoji.
- Added development tools to make iterating on emails and error pages easy.
- Added backend support for multi-use invite links (no UI for creating yet).
- Added a central debugging log for attempts to send outgoing emails.
- Added a deprecation notice for the legacy QT-based desktop app.
- Removed most remaining legacy API format endpoints.
- Removed the obsolete shortname-based syntax.
- Removed the old django-guardian dependency.
- Removed several obsolete settings.
- Partially completed migration to webpack as our static asset bundler.

### 1.6.0 -- 2017-06-06

**Highlights:**

- A complete visual redesign of the logged-out pages, including login,
registration, integrations, etc.
- New visual designs for numerous UI elements, including the emoji
picker, user profile popovers, sidebars, compose, and many more.
- A complete redesign of the Zulip settings interfaces to look a lot
nicer and be easier to navigate.
- Organization admins can now configure the login and registration
pages to show visitors a nice organization profile with custom text
and images, written in Markdown.
- Massively improved performance for presence and settings pages,
especially for very large organizations (1000+ users).
- A dozen useful new keyboard shortcuts, from editing messages to
emoji reactions to drafts and managing streams.
- Typing notifications for private message threads.
- Users can now change their own email address.
- New saved-drafts feature.
- The server can now run on a machine with as little as 2GB of RAM.
- The new [Electron desktop app][electron-app] and new
[React Native mobile app for iOS][ios-app] are now the recommended
Zulip apps.
- Mobile web now works much better, especially on iOS.
- Support for sending mobile push notifications via
[a new forwarding service][mobile-push]
- Complete translations for Spanish, German, and Czech (and
  expanded partial translations for Japanese, Chinese, French,
  Hungarian, Polish, Dutch, Russian, Bulgarian, Portuguese,
  Serbian, Malayalam, Korean, and Italian).

[mobile-push]: ../production/mobile-push-notifications.html
[electron-app]: https://github.com/zulip/zulip-electron/releases
[ios-app]: https://itunes.apple.com/us/app/zulip/id1203036395

**Full feature changelog:**

* Added Basecamp, Gogs, Greenhouse, Home Assistant, Slack, Splunk, and
  WordPress webhook integrations.
* Added LaTeX support to the markdown processor.
* Added support for filtering branches to all Git integrations.
* Added read-only access to organization-level settings for all users.
* Added UI for managing muted topics and uploaded files.
* Added UI for displaying message edit history.
* Added support for various features needed by new mobile app.
* Added deep links for settings/subscriptions interfaces.
* Added an animation when messages are edited.
* Added support for registration with GitHub auth (not just login).
* Added tracking of uploaded file quotas.
* Added option to display emoji as their alt codes.
* Added new audit log table, to eventually support an auditing UI.
* Added several new permissions-related organization settings.
* Added new endpoint for fetching presence data, useful in employee directories.
* Added typeahead for language for syntax highlighting in code blocks.
* Added support for basic markdown in stream descriptions.
* Added email notifications on new Zulip logins.
* Added security hardening before serving uploaded files.
* Added new PRIVACY_POLICY setting to provide a Markdown privacy policy.
* Added an icon to distinguish bot users as message senders.
* Added a command-line Slack importer tool using the API.
* Added new announcement notifications on stream creation.
* Added support for some newer unicode emoji code points.
* Added support for users deleting realm emoji they themselves uploaded.
* Added support for organization administrators deleting messages.
* Extended data available to mobile apps to cover the entire API.
* Redesigned bots UI.  Now can change owners and reactivate bots.
* Redesigned the visuals of code blocks to be prettier.
* Changed right sidebar presence UI to only show recently active users
  in large organizations.  This has a huge performance benefit.
* Changed color for private messages to look better.
* Converted realm emoji to be uploaded, not links, for better robustness.
* Switched the default password hasher for new passwords to Argon2.
* Increased the paragraph spacing, making multi-paragraph.
* Improved formatting of all Git integrations.
* Improved the UI of the /stats analytics pages.
* Improved search typeahead to support group private messages.
* Improved logic for when the compose box should open/close.
* Improved lightbox to support scrolling through images.
* Improved markdown support for bulleted lists.
* Improved copy-to-clipboard support in various places.
* Improved subject lines of missed message emails.
* Improved handling of users trying to login with Oauth without an account.
* Improved UI of off-the-Internet errors to not be hidden in narrow windows.
* Improved rate-limiting errors to be more easily machine-readable.
* Parallelized the backend test suite; now runs 1600 tests in <30s.
* Fixed numerous bugs and performance issues with stream management.
* Fixed an issue with the fake emails assigned to bot users.
* Fixed a major performance issue in stream creation.
* Fixed numerous minor accessibility issues.
* Fixed a subtle interaction between click-to-reply and copy-paste.
* Fixed various formatting issues with /me messages.
* Fixed numerous real-time sync issues involving users changing their
  name, avatar, or email address and streams being renamed.
* Fixed numerous performance issues across the project.
* Fixed various left sidebar ordering and live-updated bugs.
* Fixed numerous bugs with the message editing widget.
* Fixed missing logging / rate limiting on browser endpoints.
* Fixed regressions in Zulip's browser state preservation on reload logic.
* Fixed support for unicode characters in the email mirror system.
* Fixed load spikes when email mirror is receiving a lot of traffic.
* Fixed the ugly grey flicker when scrolling fast on Macs.
* Fixed previews of GitHub image URLs.
* Fixed narrowing via clicking on desktop notifications.
* Fixed Subscribed/Unsubscribed bookends appearing incorrectly.
* Eliminated the idea of a realm having a canonical domain; now
  there's simply the list of allowed domains for new users.
* Migrated avatars to a user-id-based storage setup (not email-based).
* Trailing whitespace is now stripped in code blocks, avoiding
  unnecessary scrollbars.
* Most API payloads now refer to users primarily by user ID, with
  email available for backwards-compatibility.  In the future, we may
  remove email support.
* Cleaned up Zulip's supervisord configuration.  A side effect is the
  names of the log files have changed for all the queue workers.
* Refactored various endpoints to use a single code path for security
  hardening.
* Removed support for the `MANDRILL_CLIENT` setting.  It hadn't been
  used in years.
* Changed `NOREPLY_EMAIL_ADDRESS` setting to `Name <user@example.com>`
  format.
* Disabled the web tutorial on mobile.
* Backend test coverage is now 93%, with 100% in views code.

### 1.5.2 -- 2017-06-01

- CVE-2017-0896: Restricting inviting new users to admins was broken.
- CVE-2015-8861: Insecure old version of handlebars templating engine.

### 1.5.1 -- 2017-02-07

- Fix exception trying to copy node_modules during upgrade process.
- Improved styling of /stats page to remove useless login/register links.

### 1.5.0 -- 2017-02-06

**Highlights:**

- Completely redesigned the Manage streams interface.
- Added support for emoji reactions to messages.
- Added a lightbox for viewing images and videos.
- Added an extensive user documentation site at /help/.
- Added admin setting to auto-linkify certain strings (useful for
  issue numbers and Git commit IDs).
- Upgraded how the main application runs from FastCGI on Django 1.8 to
  uwsgi and Django 1.10.
- Added preliminary support for open graph previews of links (the
  setting, `INLINE_URL_EMBED_PREVIEW`, is disabled by default in this
  release).

**Full feature changelog:**

- Added an emoji picker/browser to the compose box.
- Added markdown preview support to the compose box.
- Added a new analytics system to track interesting usage statistics.
- Added a /stats page with graphs of the analytics data.
- Added display of subscriber counts in Manage streams.
- Added support for filtering streams in Manage streams.
- Added support for setting a stream description on creation.
- Added support for copying subscribers from existing streams on creation.
- Added several new search/filtering UI elements.
- Added UI for deactivating your own Zulip account.
- Added support for viewing the raw markdown content of a message.
- Added support for deploying Zulip with subdomains for each realm.
  This entailed numerous changes to ensure a consistent experience.
- Added support for (optionally) using PGRoonga to support full-text
  search in all languages (not just English).
- Added AppFollow, GitLab, Google Calendar, GoSquared, HelloSign,
  Heroku, Librato, MailChimp, Mention, Papertrail, Sentry, Solano
  Labs, Stripe and Zapier integrations.
- Added a webhook integration for GitHub, replacing the deprecated
  github-services hook.
- Normalized the message formatting for all the Zulip Git integrations.
- Added support for VMWare Fusion Vagrant provider for faster OSX
  development.
- Added a shields.io style badge for joining a Zulip server.
- Added admin setting for which email domains can join a realm.
- Added admin setting for controlling who can create streams.
- Added admin setting to limit stream creation to older users.
- Added a notification when you muted a topic.
- Added a new hotkey for muting/unmuting topics.
- Added support for testing websockets to the Nagios plugins.
- Added a configuration option to disable websockets.
- Added support for removing one's own Zulip account.
- Added support for realm admins which auth backends are supported.
- Added new organization type concept.  This will be used to control
  whether Zulip is optimized around protecting user privacy
  vs. administrative control.
- Added #**streamName** syntax for linking to a stream.
- Added support for viewing markdown source of messages.
- Added setting to always send push notifications.
- Added setting to hide private message content in desktop
  notifications.
- Added buttons to download .zuliprc files.
- Added italics and strikethrough support in markdown implementation.
- Added errors for common installations mistakes (e.g. too little RAM).
- Added a new /authors page showing the contributors to the current
  Zulip version.
- Added illustrations to the 404 and 500 pages.
- Upgraded all Python dependencies to modern versions, including
  Django 1.10 (all of Zulip's patches have been merged into mainline).
- Increased backend test coverage of Python codebase to 90%.
- Increased mypy static type coverage of Python code to 100%.
- Added several new linters (eslint, pep8) and cleaned the codebase.
- Optimized the speed of the Zulip upgrade process, especially with Git.
- Have peer_add events send user_id, not email.
- Fixed problems with rabbitmq when installing Zulip.
- Fixed JavaScript not being gzip-compressed properly.
- Fixed a major performance bug in the Tornado service.
- Fixed a frontend performance bug creating streams in very large realms.
- Fixed numerous bugs where strings were not properly tagged for translation.
- Fixed several real-time sync bugs, and removed several AJAX calls.
  Zulip should be more performant than ever before.
- Fixed Zulip Tornado service not working with http_proxy set in environment.
- Fixed text overflow in stream subscriptions.
- Fixed CSS issues with message topic editing.
- Fixed several transactionality bugs (e.g. in Huddle creation).
- Fixed missed-message email configuration error handling.
- Fixed annoying @-mentions in Jira integration.
- Fixed various mismatches between frontend and backend markdown
  implementations.
- Fixed various popover-related UI bugs.
- Fixed duplicate notifications with multiple open Zulip tabs.
- Fixed support for emailing the server administrator about backend exceptions.
- Cleaned up the "edit message" form.
- Eliminated most of the legacy API endpoints.
- Improved typeahead and autocomplete across the application.
  Highlights include much better handling of many users with similar names.
- Improved the color scheme for code blocks.
- Improved the message editing UI in several ways.
- Improved how dates are displayed in the UI.
- Improved default settings for zxcvbn password strength checker.
- Upgraded jQuery to the latest 1.12 release.
- Made numerous improvements to the development tooling.
- Made extensive improvements to code organization.
- Restyled all the registration pages to look nicer and be responsive.
- Extensively refactored views to use common functions for fetching
  stream and message objects.
- Suppressed @-all mentions being treated as mentions on muted
  streams.
- Documented preliminary design for interactive bot system.

### 1.4.3 - 2017-01-29
- CVE-2017-0881: Users could subscribe to invite-only streams.

### 1.4.2 - 2016-09-27

- Upgraded Django to version 1.8.15 (with the Zulip patches applied),
  fixing a CSRF vulnerability in Django (see
  https://www.djangoproject.com/weblog/2016/sep/26/security-releases/),
  and a number of other Django bugs from past Django stable releases
  that largely affects parts of Django that are not used by Zulip.
- Fixed buggy logrotate configuration.

### 1.4.1 - 2016-09-03

- Fixed settings bug upgrading from pre-1.4.0 releases to 1.4.0.
- Fixed local file uploads integration being broken for new 1.4.0
  installations.

### 1.4.0 - 2016-08-25

- Migrated Zulip's python dependencies to be installed via a virtualenv,
  instead of the via apt.  This is a major change to how Zulip
  is installed that we expect will simplify upgrades in the future.
- Fixed unnecessary loading of zxcvbn password strength checker.  This
  saves a huge fraction of the uncached network transfer for loading
  Zulip.
- Added support for using Ubuntu Xenial in production.
- Added a powerful and complete realm import/export tool.
- Added nice UI for selecting a default language to display settings.
- Added UI for searching streams in left sidebar with hotkeys.
- Added Semaphore, Bitbucket, and HelloWorld (example) integrations.
- Added new webhook-based integration for Trello.
- Added management command for creating realms through web UI.
- Added management command to send password reset emails.
- Added endpoint for mobile apps to query available auth backends.
- Added LetsEncrypt documentation for getting SSL certificates.
- Added nice rendering of unicode emoji.
- Added support for pinning streams to the top of the left sidebar.
- Added search box for filtering user list when creating a new stream.
- Added realm setting to disable message editing.
- Added realm setting to time-limit message editing.  Default is 10m.
- Added realm setting for default language.
- Added year to timestamps in message interstitials for old messages.
- Added GitHub authentication (and integrated python-social-auth, so it's
  easy to add additional social authentication methods).
- Added TERMS_OF_SERVICE setting using markdown formatting to configure
  the terms of service for a Zulip server.
- Added numerous hooks to puppet modules to enable more configurations.
- Moved several useful puppet components into the main puppet
  manifests (setting a redis password, etc.).
- Added automatic configuration of postgres/memcached settings based
  on the server's available RAM.
- Added scripts/upgrade-zulip-from-git for upgrading Zulip from a Git repo.
- Added preliminary support for Python 3.  All of Zulip's test suites now
  pass using Python 3.4.
- Added support for `Name <email@example.com>` format when inviting users.
- Added numerous special-purpose settings options.
- Added a hex input field in color picker.
- Documented new Electron beta app and mobile apps in the /apps/ page.
- Enabled Android Google authentication support.
- Enhanced logic for tracking origin of user uploads.
- Improved error messages for various empty narrows.
- Improved missed message emails to better support directly replying.
- Increased backend test coverage of Python code to 85.5%.
- Increased mypy static type coverage of Python code to 95%.  Also
  fixed many string annotations to properly handle unicode.
- Fixed major i18n-related frontend performance regression on
  /#subscriptions page.  Saves several seconds of load time with 1k
  streams.
- Fixed Jinja2 migration bug when trying to register an email that
  already has an account.
- Fixed narrowing to a stream from other pages.
- Fixed various frontend strings that weren't marked for translation.
- Fixed several bugs around editing status (/me) messages.
- Fixed queue workers not restarting after changes in development.
- Fixed Casper tests hanging while development server is running.
- Fixed browser autocomplete issue when adding new stream members.
- Fixed broken create_stream and rename_stream management commands.
- Fixed zulip-puppet-apply exit code when puppet throws errors.
- Fixed EPMD restart being attempted on every puppet apply.
- Fixed message cache filling; should improve perf after server restart.
- Fixed caching race condition when changing user objects.
- Fixed buggy puppet configuration for supervisord restarts.
- Fixed some error handling race conditions when editing messages.
- Fixed fastcgi_params to protect against the httpoxy attack.
- Fixed bug preventing users with mit.edu emails from registering accounts.
- Fixed incorrect settings docs for the email mirror.
- Fixed APNS push notification support (had been broken by Apple changing
  the APNS API).
- Fixed some logic bugs in how attachments are tracked.
- Fixed unnecessarily resource-intensive rabbitmq cron checks.
- Fixed old deployment directories leaking indefinitely.
- Fixed need to manually add localhost in ALLOWED_HOSTS.
- Fixed display positioning for the color picker on subscriptions page.
- Fixed escaping of Zulip extensions to markdown.
- Fixed requiring a reload to see newly uploaded avatars.
- Fixed @all warning firing even for `@all`.
- Restyled password reset form to look nice.
- Improved formatting in reset password links.
- Improved alert words UI to match style of other settings.
- Improved error experience when sending to nonexistent users.
- Portions of integrations documentation are now automatically generated.
- Restructured the URLs files to be more readable.
- Upgraded almost all Python dependencies to current versions.
- Substantially expanded and reorganized developer documentation.
- Reorganized production documentation and moved to ReadTheDocs.
- Reorganized .gitignore type files to be written under var/
- Refactored substantial portions of templates to support subdomains.
- Renamed local_settings.py symlink to prod_settings.py for clarity.
- Renamed email-mirror management command to email_mirror.
- Changed HTTP verb for create_user_backend to PUT.
- Eliminated all remaining settings hardcoded for zulip.com.
- Eliminated essentially all remaining hardcoding of mit.edu.
- Optimized the performance of all the test suites.
- Optimized Django memcached configuration.
- Removed old prototype data export tool.
- Disabled insecure RC4 cipher in nginx configuration.
- Enabled shared SSL session cache in nginx configuration.
- Updated header for Zulip static assets to reflect Zulip being
  open source.

### 1.3.13 - 2016-06-21
- Added nearly complete internationalization of the Zulip UI.
- Added warning when using @all/@everyone.
- Added button offering to subscribe at bottom of narrows to streams
  the user is not subscribed to.
- Added integrations with Airbrake, CircleCI, Crashlytics, IFTTT,
  Transifex, and Updown.io.
- Added menu option to mark all messages in a stream or topic as read.
- Added new Attachment model to keep track of uploaded files.
- Added caching of virtualenvs in development.
- Added mypy static type annotations to about 85% of the Zulip Python codebase.
- Added automated test of backend templates to test for regressions.
- Added lots of detailed documentation on the Zulip development environment.
- Added setting allowing only administrators to create new streams.
- Added button to exit the Zulip tutorial early.
- Added web UI for configuring default streams.
- Added new OPEN_REALM_CREATION setting (default off), providing a UI
  for creating additional realms on a Zulip server.
- Fixed email_gateway_password secret not working properly.
- Fixed missing helper scripts for RabbitMQ Nagios plugins.
- Fixed skipping forward to latest messages ("More messages below" button).
- Fixed netcat issue causing Zulip installation to hang on Scaleway machines.
- Fixed rendering of /me status messages after message editing.
- Fixed case sensitivity of right sidebar fading when compose is open.
- Fixed error messages when composing to invalid PM recipients.
- Fixed LDAP auth backend not working with Zulip mobile apps.
- Fixed erroneous WWW-Authenticate headers with expired sessions.
- Changed "coworkers" to "users" in the Zulip UI.
- Changed add_default_stream REST API to correctly use PUT rather than PATCH.
- Updated the Zulip emoji set (the Android Emoji) to a modern version.
- Made numerous small improvements to the Zulip development experience.
- Migrated backend templates to the faster Jinja2 templating system.
- Migrated development environment setup scripts to tools/setup/.
- Expanded test coverage for several areas of the product.
- Simplified the API for writing new webhook integrations.
- Removed most of the remaining JavaScript global variables.

### 1.3.12 - 2016-05-10
- CVE-2016-4426: Bot API keys were accessible to other users in the same realm.
- CVE-2016-4427: Deactivated users could access messages if SSO was enabled.
- Fixed a RabbitMQ configuration bug that resulted in reordered messages.
- Added expansive test suite for authentication backends and decorators.
- Added an option to logout_all_users to delete only sessions for deactivated users.

### 1.3.11 - 2016-05-02
- Moved email digest support into the default Zulip production configuration.
- Added options for configuring Postgres, RabbitMQ, Redis, and memcached
  in settings.py.
- Added documentation on using Hubot to integrate with useful services
  not yet integrated with Zulip directly (e.g. Google Hangouts).
- Added new management command to test sending email from Zulip.
- Added Codeship, Pingdom, Taiga, Teamcity, and Yo integrations.
- Added Nagios plugins to the main distribution.
- Added ability for realm administrators to manage custom emoji.
- Added guide to writing new integrations.
- Enabled camo image proxy to fix mixed-content warnings for http images.
- Refactored the Zulip puppet modules to be more modular.
- Refactored the Tornado event system, fixing old memory leaks.
- Removed many old-style /json API endpoints
- Implemented running queue processors multithreaded in development,
  decreasing RAM requirements for a Zulip development environment from
  ~1GB to ~300MB.
- Fixed rerendering the complete buddy list whenever a user came back from
  idle, which was a significant performance issue in larger realms.
- Fixed the disabling of desktop notifications from 1.3.7 for new users.
- Fixed the (admin) create_user API enforcing restricted_to_domain, even
  if that setting was disabled for the realm.
- Fixed bugs changing certain settings in administration pages.
- Fixed collapsing messages in narrowed views.
- Fixed 500 errors when uploading a non-image file as an avatar.
- Fixed Jira integration incorrectly not @-mentioning assignee.

### 1.3.10 - 2016-01-21
- Added new integration for Travis CI.
- Added settings option to control maximum file upload size.
- Added support for running Zulip development environment in Docker.
- Added easy configuration support for a remote postgres database.
- Added extensive documentation on scalability, backups, and security.
- Recent private message threads are now displayed expanded similar to
  the pre-existing recent topics feature.
- Made it possible to set LDAP and EMAIL_HOST passwords in
  /etc/zulip/secrets.conf.
- Improved the styling for the Administration page and added tabs.
- Substantially improved loading performance on slow networks by enabling
  GZIP compression on more assets.
- Changed the page title in narrowed views to include the current narrow.
- Fixed several backend performance issues affecting very large realms.
- Fixed bugs where draft compose content might be lost when reloading site.
- Fixed support for disabling the "zulip" notifications stream.
- Fixed missing step in postfix_localmail installation instructions.
- Fixed several bugs/inconveniences in the production upgrade process.
- Fixed realm restrictions for servers with a unique, open realm.
- Substantially cleaned up console logging from run-dev.py.

### 1.3.9 - 2015-11-16
- Fixed buggy #! lines in upgrade scripts.

### 1.3.8 - 2015-11-15
- Added options to the Python api for working with untrusted server certificates.
- Added a lot of documentation on the development environment and testing.
- Added partial support for translating the Zulip UI.
- Migrated installing Node dependencies to use npm.
- Fixed LDAP integration breaking autocomplete of @-mentions.
- Fixed admin panel reactivation/deactivation of bots.
- Fixed inaccurate documentation for downloading the desktop apps.
- Fixed various minor bugs in production installation process.
- Fixed security issue where recent history on private streams might
  be visible to new users (to the Zulip team) who were invited with that
  private stream as one of their initial streams
  (https://github.com/zulip/zulip/issues/230).
- Major preliminary progress towards supporting Python 3.

### 1.3.7 - 2015-10-19
- Turn off desktop and audible notifications for streams by default.
- Added support for the LDAP authentication integration creating new users.
- Added new endpoint to support Google auth on mobile.
- Fixed desktop notifications in modern Firefox.
- Fixed several installation issues for both production and development environments.
- Improved documentation for outgoing SMTP and the email mirror integration.