Check YouTube Availabitlity for Video Tests
Add missing mimetypes for xblock resources
Annotation Tools: Load Tinymce in student_view
Annotation Tools: Fixing tests for student_view

Fixed typo from autocomplete

Fixed dict for tests
Add mimetype additions in studio startup
Merge pull request #3871 from edx/dcadams/fix_metrics_tab_after_opaque_keys

Fixes some stuff for metrics tab
Merge pull request #3717 from mitocw/cg/studio_addl_apps

Add ADDL_INSTALLED_APPS to studio for parity with lms
Allow editing of container xblocks/xmodules

STUD-1312
Merge pull request #3905 from edx/flowerhack/change-hardcoded-defaults

Moved hardcoded defaults into settings
Merge pull request #3819 from edx/andya/edit-containers

Allow editing of container xblocks/xmodules
lms dashboard ignores errored courses
Updated version of event-tracking library to 0.1.0
corrected a typo; tried to clarify a different sentence
Merge pull request #3882 from edx/ammar/test-youtube-availibility

Check YouTube Availability for Video Tests
Merge pull request #3927 from edx/ahodges/documentation/DOC438

corrected a typo; tried to clarify a different sentence
Update help for welcome, register, and login pages

All now go to getting started, but have different tokens, for further
segmenting later.
Welcome page text edits
Merge pull request #3896 from edx/will/install-ease-and-requirements

Install EASE and requirements
Merge pull request #3841 from edx/fix/large-email-queries-2

Fix/large email queries 2
Move to OpaqueKey implementations from the external library

[LMS-2757]