variable name error

The variable name --- `dist` error
`dist` = {}  will cover `dist = grades.answer_distributions(course.id)`
fix preview link generation for course reruns (PLAT-336)
Add back end for Studio video upload feature

This feature allows upload of video assets to S3. This requires that the
VIDEO_UPLOAD_PIPELINE setting be properly configured and that each
course be configured with a token issued by the media team for their
processing purposes (e.g. linking the video with a YouTube channel).

Co-authored-by: Greg Price <gprice@edx.org>
Add front end for Studio video upload feature

Co-authored-by: Chris <crodriguez@edx.org>
Co-authored-by: Mark Hoeber <hoeber@edx.org>
Studio video upload feature template and styling

Co-authored-by: Greg Price <gprice@edx.org>
also apply sorting rules overrides to the /courses view
Merge pull request #6257 from edx/mobile/video-pipeline-squashed

Add video upload feature to Studio
Merge pull request #6262 from edx/cdodge/also-sort-in-courses-list

also apply sorting rules overrides to the /courses view
Update translations (autogenerated message)
Merge pull request #6265 from edx/sarina/2014-12-15-translations-updates

Update translations (autogenerated message)
Hook up new payment/verification flow to dashboard, track selection page, and upgrade
Added test for OpenAssessmentBlock mixin.
TNL-1022
update ora version
Merge pull request #6291 from edx/hotfix/2014-12-17

Hotfix/2014 12 17
Update AUTHORS
Update AUTHORS
updated commit hash for VAL
Merge pull request #6317 from edx/hotfix/val-error

updated commit hash for VAL
Tender widget inavailability stops loading studio page

When tender_widget.js is inavailable studio page stops
loading becuase of error in the requirejs. It is
dependency in the requirejs so when it doesn't load
it cause other dependencies to stop loading.

TNL-1018
for tests change the default xml data dir to a place where it will get cleaned up