Hotfix 2016-09-15 release to master

ECOM 4945 Revert to No RequireJS

TNL-5437 Reverted to no RequireJS

Fix grade push back for non-components through LTI

Unifying calls to helper values

bok choy tests for persistent grades

TNL-5115: Remove sort order from Discussions in edx-platform

There is a bug introduced in this commit:
https://github.com/edx/edx-platform/commit/22046d4067595f785365554b430fad1fc9d85000#diff-32687833c38e231b51a8f27a76c72a56R119
The return value of the locations_to_weighted_scores[location] is
changed from `Score` object to a tuple (Score, weight). However, the
left side of assignment didn't get updated. So an error is raised and
the Celery task failed to continue. Thus, no grade is being passed back.

- Default of "desc" is all that is in use, and remains as-is.
- Discussion API keeps order_direction param, to minimize changes,
but it only accepts "desc".
- Discussion webapp simply no longer sends in the sort order.

pa11ycrawler 1.5.2

Revert "pa11ycrawler 1.5.1"

Update translations (autogenerated message)

Add font awesome loading spinner to CAPA problems

pa11ycrawler 1.5.1

AC-578 fixing link in label on logistration form

- loading spinner is automatically replaced by the content when AJAX problem_get returns

Merge release back into master

Make Robust Grades Robust Again

Update coverage version to 4.2

Don't delete question p-tag if children.

Reduce sql queries with persisted grades

As part of the Robust Grades rollout, we expect to see some DatabaseErrors in
various methods that write to the database. Since the success of this write
operation is not needed for the end-user, we just log and swallow the error.

In the future, we'll also enqueue an async task to finish the write operation
that failed.

TNL-5458
TNL-5493

TNL-5510

Change edx-django-release-util version.

Update opaque-keys and ccx-keys versions.

Merging hotfix/2016-09-13 release into master

Fix the duplicate oauth_body_hash in the outcomes request