Known issues:
* No support for whitelabeling in the email
* No whitelabeling for any externally-visible branding
(imported from commit 9eab7b0744e56a87007b8621a8bb18bbb1080256)
The problem here is that some error-related templates render without
the context managers that we specify, and so we want the handling of
"the context was not set" to default to the enterprise case (because
the enterprise version will work basically fine on !enterprise, but
the opposite is not true because the enterprise distribution doesn't
even have the templates for certain !enterprise pages that may be
linked to).
(imported from commit 7547311d87e048d33221587f44b82fe0ba320ca1)
This brings several improvements:
* The Dropbox script won't slow loading our app.
* If it fails to load, no traceback; Dropbox link just won't appear.
* For users with Dropbox disabled (most at this point), no loading at all.
(imported from commit e71ae5790fc85a185e622bdafb350109527b4eee)
This needs to be deployed to both staging and prod at the same
off-peak time (and the schema migration run).
At the time it is deployed, we need to make a few changes directly in
the database:
(1) UPDATE django_content_type set app_label='zerver' where app_label='zephyr';
(2) UPDATE south_migrationhistory set app_name='zerver' where app_name='zephyr';
(imported from commit eb3fd719571740189514ef0b884738cb30df1320)