add infinity symbol to calc preview
Add more tests for the container page
Make course_id a required arg to split.create_course
and remove attempt to make it unique. Instead raise exception on dupe.
STUD-1359
Clean up quality violations in split_test module
Merge pull request #2846 from edx/sarina/fix-splittest-quality

Clean up quality violations in split_test module
Fix "Course started?" display on beta dash LMS-1548
BLD-896: Fix cc button in HTML5 videos.
Merge pull request #2792 from edx/anton/fix-cc-button

Anton/fix cc button
Merge pull request #2850 from edx/sarina/lms-1548

Fix "Course started?" display on beta dash LMS-1548
BLD-852: Fix video positioning in full view mode.
Adjust wording around grade reports LMS-2109
Merge pull request #2813 from edx/anton/fix-transcript-in-full-screen-mode

Fix video positioning in full view mode.
Merge pull request #2858 from edx/sarina/lms-2109

Adjust wording around grade reports LMS-2109
Rename "Forum" roles on inst dash LMS-2092
Update discussions documentation LMS-2092
Merge pull request #2860 from edx/sarina/lms-2092

Rename "Forum" roles on inst dash LMS-2092
Only add mentoring application to INSTALLED_APPS when in virtualenv
Update import location of `prefer_xmodules`
Normalize the representation of Scope.content data in MongoModulestore FieldData

Without this, the new 'items' field in the course_info xmodule caused
bizarre behavior. If you added the text 'items' to a course_info
section, then the LMS would throw a 500, because the field name isn't
'data', but the stored data is a string, leading to the check of
`key.field_name in self._data`, where key.field_name is the string 'items',
and self._data is the content string.
Merge pull request #2811 from edx/andya/container-unit-tests

Add more tests for the container page