Adds a new field org_type to Realm. Defaults for restricted_to_domain
and invite_required are now controlled by org_type at time of realm
creation (see zerver.lib.actions.do_create_realm), rather than at the
database level. Note that the backend defaults are all
org_type=corporate, since that matches the current assumptions in the
codebase, whereas the frontend default is org_type=community, since if
a user isn't sure they probably want community.
Since we will likely in the future enable/disable various
administrative features based on whether an organization is corporate
or community, we discuss those issues in the realm creation form.
Before we actually implement any such features, we'll want to make
sure users understand what type of organization they are a member of.
Choice of org_type (via radio button) has been added to the realm
creation flow and the realm creation management command, and the
open-realm option removed.
The database defaults have not been changed, which allows our testing code
to work unchanged.
[includes some HTML/CSS work by Brock Whittaker to make it look nice]
This adds support for running a Zulip production server with each
realm on its own unique subdomain, e.g. https://realm_name.example.com.
This patch includes a ton of important features:
* Configuring the Zulip sesion middleware to issue cookier correctly
for the subdomains case.
* Throwing an error if the user tries to visit an invalid subdomain.
* Runs a portion of the Casper tests with REALMS_HAVE_SUBDOMAINS
enabled to test the subdomain signup process.
* Updating our integrations documentation to refer to the current subdomain.
* Enforces that users can only login to the subdomain of their realm
(but does not restrict the API; that will be tightened in a future commit).
Note that toggling settings.REALMS_HAVE_SUBDOMAINS on a live server is
not supported without manual intervention (the main problem will be
adding "subdomain" values for all the existing realms).
[substantially modified by tabbott as part of merging]