[TNL-287] Text Annotation Tool: Reply/Grouping Bug Fix
pass along an extra parameter to CyberSource to sepcify a callback URL if the user clicks cancel

typo
Ex-79 Bug Fixed. If there is no coupon code,  'Generate Registration Codes' modal dialog does not appear
Clean up conventions for underscores vs. dashes in config setting.
Add tracking on expand of upsell message
[TNL-293] Annotation Tool: Fixed TinMCE issue when changing units

- fixed tinymce editors condition to check only positive numbers
Add matplotlib to the sandbox requirements.

Used by MITx/6.341x
Ensure group info is present in LMS responses.

TNL-24
Prepare track selection page for new audit track
Merge pull request #5198 from edx/feanil/sandbox_matplotlib

Add matplotlib to the sandbox requirements.
Merge pull request #5184 from edx/renzo/upsell-tracking

Add tracking on expand of upsell message
Merge pull request #5146 from lduarte1991/lduarte-harvardx-pr23

Text Annotation Tool: Reply/Grouping Bug Fix
Merge pull request #5172 from edx/jsa/tnl24

test that group_id attribute is present and correct in LMS responses
Remove Django Waffle
Merge pull request #5165 from lduarte1991/lduarte-harvardx-pr25

Annotation Tool: Fixed TinyMCE issue when changing units
Merge pull request #5170 from edx/muhhshoaib/Ex-79-BUG-if-no-coupon-code-defined-registration-codes-modal-dialog-box-does-not-appear

Ex-79 Bug Fixed. If there is no coupon code, 'Generate Registration Codes' modal dialog does not appear.
Html escaped from display name in xblock.
LMS-11194
Fixed video not playing after changing speed to anything other than 1.
BLD-1221
Merge pull request #4749 from edx/waheed/lms11194-xblock-allow-html-and-script-in-dusplay-name

Html escaped from display name in xblock.
Merge pull request #5055 from edx/waheed/bld1221-fix-video-not-play-in-firefox-on-speed-change

Fixed video not playing after changing speed to anything other than 1.