add infinity symbol to calc preview
Make course_id a required arg to split.create_course
and remove attempt to make it unique. Instead raise exception on dupe.
STUD-1359
Fixed module urls creation in legacy instructor dashboard.

LMS-2327
Fix undefined references to pytz
Enable advanced components by default in devstack
Merge pull request #2877 from edx/usman/lms2327-instructor-dashboard-problem-urls

Fixed module urls creation in legacy instructor dashboard.
Fix Firefox YouTube default Flash mode

BLD-895
Converting collapsible module to JavaScript.
Merge pull request #2841 from edx/valera/fix_firefox_youtube_default_flash_mode

Fix Firefox YouTube default Flash mode
Don't close modal on click outside new course update modal.
STUD-1404
Add a missing comment documenting the changes done in PR 2841.
Fixed course update css to match changed tags
Merge pull request #2884 from edx/dcs/fix-update-css

Fixed course update css to match changed tags
remove old version of codemirror, to prevent confusion
Merge pull request #2859 from edx/waheed/stud1404-accidental-click-can-lose-work-on-adding-new-update

Don't close modal on click outside new course update modal.
Fix for CourseFactory bug - course object not saved after setattr called
Generalize grade report to allow display of any report

We would like to be able to generate arbitrary reports and expose them to the instructor by simply uploading them to S3.  The existing grade download infrastructure pretty much supported that already, however, all of the internal and external structures were referring to the reports as exclusively grading related.

Fixes: AN-590
Put language modal in alphabetical order LMS-2302
Merge pull request #2849 from edx/dhm/split_course_id

Make course_id a required arg to split.create_course
Merge pull request #2896 from edx/sarina/LMS-2302

Put language modal in alphabetical order LMS-2302