Add ADDL_INSTALLED_APPS to studio for parity with lms
Allow courses to set Matlab API key globally, in advanced settings.
Updated payload for new matlab endpoint.
Moved hardcoded defaults into settings
Don't hardcode https protocol in enrollment emails.

Use http or https, depending on the value of `request.is_secure()`.
That is how links in most other emails are handled.
Fixes some stuff in metrics tab
  Fixes some 500s after opaque-keys
  Adds a test which would have caught the 500s
  Fixes Transifex problem on the string % of students
Ensure no old gems are left behind between test runs.
No longer chunk queries when sending out bulk email (LMS-2718)

refactor _generate_items_for_subtask not to chunk queries

use django's iterator methor for querysets

remove bulk email query settings

use read_replica if available, since this is read-only

update changelog
Add EASE to edx-platform requirements
Check YouTube Availabitlity for Video Tests
Annotation Tools: Load Tinymce in student_view
Annotation Tools: Fixing tests for student_view

Fixed typo from autocomplete

Fixed dict for tests
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
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