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
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.
Speed up test for closed caption state
courseware/views.py index function position value integer error correction and test

LMS-2844
changing dot into v
Fix seek log.
fix reply/return to annotation links
STUD-1629
Reduce captions wait time.
Improve certificates test time
Merge pull request #4106 from edx/anton/fix-seek-log

Video: fix seek tracking log.
Merge pull request #3898 from edx/zub/bugfix/std1629-annotationtool

fix reply/return to annotation links