forums: fix assign_default_role to use the correct constant.
Fix the CoursePagesTest
update opaque keys dependency to fix install
Bump opaque_key dependency to 0.1.1
Allow xblocks to be added as advanced problem types
shim to update ruby/node, not python reqs
missed commit
trigger change event for file field while uploading pdf
STUD-1775
Add examples of html5 videos to docstrings.
Merge pull request #4104 from edx/alex/return_html5_video_sources_in_docstring_for_easy_testing

Add examples of html5 videos to docstrings.
implement forums endpoint for searching users
Merge pull request #4041 from edx/jsa/forums-search-users

implement forums endpoint for searching users.
Merge pull request #4089 from edx/zoldak/courses-test

Fix the CoursePagesTest
Merge pull request #4054 from edx/zub/bugfix/std1775-uploadpdfbutton

trigger change event for file field while uploading pdf
Fixed MATLAB Run Code bug with answer boxes.
LMS-2807
Refactor heartbeat to delegate to the modulestores and sql
LMS-2801
Speed up test by fixing negative assertion
Merge pull request #4099 from edx/andya/rc-xblocks-as-advanced-problems

Allow xblocks to be added as advanced problem types
Merge pull request #4111 from edx/waheed/lms2807-matlab-run-code-bug-fixed

Waheed/lms2807 matlab run code bug fixed
Fix i18n in ChoiceGroup and ChoiceTextGroup.