Bring DoneXBlock to production-level code

SOL-1528: Generate Certificates for whitelisted students even if they have existing (notpassing, error etc.) certificates 

MA-1051 - DiscussionAPI: Remove http errors from api.py

SOL-1418: display certificate generate history in reverse chronological order

Make pagination pattern sass globally available in LMS

LMS: addressing contrast issues on the Progress page

WIP for financial support tool.

Allows support staff or global staff to view a list of a learner's
enrollments, and change enrollment modes. We generate a
ManualEnrollmentAudit record for these enrollment changes in order to
track updates. Additionally, enrollment changes are handled through
the enrollment API, which handles bookkeeping such as granting refunds
where appropriate.

ECOM-2825

Release

generate_course_overview management command error handling

MA-1046 added valid form field test

Delete dead SUBDOMAIN_BRANDING setting.

LMS: addressing contrast on the Instructor dashboard

Rc/2015 12 16

Add new i18n markupsafe helper methods.

Fixed toggle by clicking on the note failing on Chrome

Protect against divide by zero in DataDog event.

Add test for zero total/max score in a problem.

PHX-161 Studio: Set Review Rules for a Proctored Exam

- added the new field review_rules for software secure
- added a new tab name "Additional Settings" for the proctored/timed exams

Revert "set path explicitly for storing cookie"

Remove dead code

CMS: removing H1 and H2, adding H4, H5, and H6 to TinyMCE

Revert "Remove staff debug category type whitelist."

Add the ActiveTable and Vector Draw XBlocks to ADVANCED_COMPONENT_TYPES.