forums: fix assign_default_role to use the correct constant.
FormulaEquationInput: i18n
ChemicalEquationInput: i18n
MatlabInput: i18n
Fix the CoursePagesTest
shim to update ruby/node, not python reqs
Merge pull request #4087 from edx/jmclaus/i18n-matlab-input

MatlabInput: i18n
Merge pull request #4085 from edx/jmclaus/i18n-chemical-equation-input

ChemicalEquationInput: i18n
missed commit
Merge pull request #4084 from edx/jmclaus/i18n-formula-equation-input

FormulaEquationInput: i18n
Allow xblocks to be added as advanced problem types
Merge pull request #4059 from edx/andya/xblocks-as-advanced-problems

Allow xblocks to be added as advanced problem types
Merge pull request #4098 from edx/e0d/paver-shim

shim to update ruby/node, not python reqs
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