Allow turning off Video CDN in Studio.

BLD-1207
Annotator Tools: Fix major logic bug in code
Add Optimizely widget
Merge pull request #4760 from edx/oleg/turn-off-cdn-rc

Allow turning off Video CDN in Studio.
Merge pull request #4764 from edx/diana/show-cert-without-end-date

Show Certificates Before End
Merge pull request #4763 from edx/lms/add-optimizely

Lms/add optimizely
Merge pull request #4762 from edx/annotations-js-fix

Annotator Tools: Fix major logic bug in code (RC)
Remove banner from instructor dashboard
Reenable user partition in Advanced Settings.
Merge pull request #4775 from edx/alex/fix-reenable-user-partitions

Reenable user partition in Advanced Settings.
Capture console log on lettuce test failure
Improve stability of test_studio_outline tests.

STUD-2084
add how to file a bug report link to readme
Doc changes for new publishing workflow
Fix for empty imsx_messageIdentifier
Merge pull request #4638 from edx/zoldak/lettuce-log-js-console

Capture console log on lettuce test failure
Merge pull request #4785 from edx/adam/add-link-to-readme

add how to file a bug report link to readme
Merge pull request #4781 from edx/christina/publishing-tests

Improve stability of test_studio_outline tests.
Merge pull request #4356 from edx/markhoeber/documentation/publishing-changes

WIP: Documentation for Publishing Changes
Merge pull request #4237 from starteam/master

Fix for empty imsx_messageIdentifier