Declare PYTHONPATH in i18n:test rake task

Alert users when forum AJAX requests fail 

AJAX requests on forums pages occasionally fail (usually when a request
to the comments service times out), but the user is not made aware of
the failure. This manifests as either the system not appearing to store
state (e.g. if an attempt to flag a post fails) or something taking
forever to load. Now, a modal will pop up to alert the user that a
request has failed and instruct them to reload the page.

In the longer term, we should fix each user gesture that results in an
AJAX call to gracefully handle a failure by resetting the state of the
world appropriately and aleritng the user.

JIRA: FOR-37

Flowerhack/feature/refactor to track enrollment

Video player: fix acceptance test.

LMS: add CSRF token to register form

Add template for checkboxes to studio.

Stop video skipping links from showing up when not needed and address the issue of skip links for multiple videos.

adding override for GITHUB_REPO_ROOT

allow override for STATIC_URL

This is the base directory for course data

Stop video skipping links from showing up when not needed and address the issue of skip links for multiple videos.

Fixes BLD-521

fix emission of enrollment events from the CMS

fix spammy log messages from course_id tracking in CMS

I suspect there are very few circumstances that an enrollment event is emitted from the CMS, but if it ever were to happen, it would bomb out because the "crum" middleware is not used in that app.  We are hoping to replace this request caching hack in the near future, but for now it is the best option we could come up with.

I noticed the stack appear when I created a new course in my dev environment.  Presumably the course author is automatically enrolled in the course, which, causes the tracking code to bomb out.  Luckily we catch the error and just log it, but we really should be capturing this type of enrollment event.

Email port to beta dash and new option for shibboleth courses

Fixed bug where Flash photo taker would fail

into beta dashboard.

Also includes new functionality, in both legacy and beta
dashboard, to include appropriate email text for a
Shibboleth course.

Video player: improvements.

Video: tests to check speed change

Change save_item and create_item to be RESTful.

hidden-module-unicode: Return unicode string to pass assertion

Studio: Resolves Notifications UI showing in IE9 + CSS Split

Sarina/persist student answers on error

Part of STUD-847.