It seems like self.tabs is getting set to an empty set [] now rather than None. This causes the tab defaulting to not populate, leading to crashes in the LMS if someone makes a new course with additional tabs (e.g. static tabs or pdf-textbooks)

add a /jump_to_id/ shortcut for producing more durable links between cou...

Link section to course outline

Peter fogg/notification stories

Trim whitespace when adding course authors.

change from_xml class method on video class to make sure we honor the fa...

Change "asset" to "PDF" in textbooks interface

Make XModuleDescriptor use the XBlock children API

Word cloud tests

Studio: adds a space back to the phrase 'Welcome to edX Studio'

N.B. When we are in a world of mixed XModules and XBlocks, the
system/runtime will have to be cognizant of that when asked to return a
XModule from an XModuleDescriptor child

[#LMS-190]

Correctly persist checklist settings.

Incidentally, fixes an acceptance test (which would have caught this
bug) not running. Its step regex was "They are correctly selected
after I reload the page$", which happens to be matched by "I reload
the page$", another step definition. Lettuce seems to arbitrarily pick
between definitions if they both match a step, so it's good to ensure
that each step isn't a sub-regexes of another.

Add endpoints to set user notification preference

Fixes for `vagrant up`

Two endpoints are intended to be used by AJAX calls from the web UI with an
authenticated user. When enabled, the value of the preference is an encryption
of the username, to be used as a token for one-click unsubscribe links. The
third endpoint is the target of unsubscribe links, which displays a page with
an appropriate message to the user.

Validate date/time settings when typed in directly.

CMS i18n changes from Tsinghua