Avoid to use an unsupported '/' operand between two unicode strings

Remove icon-aria-hidden rule for a11y discussions

Adjustments to course dashboard visual styles 

Replace discussion topic selector with a native dropdown

TNL-4637 TNL-4641 TNL-4645

lms/navigation.feature to bokchoy

Fix color-contrast a11y failures in Discussions

Merge release into master

Readd imports to fix broken tests

LMS context sensitive help minor fixes

Revert modal dialog changes

Explicit grade values so saved grades are immune to subsection graded

This reverts commit 3c84b7a1.

This reverts commit ae849406.

TNL-5560

MA-2139: Mark thread as read for learner on thread/comment creation 

Show location in the settings xblock.

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"