BLD-1000: Download handout.
Move experiments.rst into the en_us directory
Merge pull request #3428 from edx/zoldak/fix-lang-test

Wait for ajax post after changing language
Merge pull request #3369 from edx/anton/download-handout

Video: Add Download Handout
doc for LMS-2525: feature changes for student enrollment
Merge pull request #3388 from edx/ahodges/documentation/LMS2525

Ahodges/documentation/lms2525
Merge pull request #3429 from edx/move-experiments-rst

Move experiments.rst into the en_us directory
JavaScript extentions doc update

doc-255
Update screenshots and add feedback prompt info
Removed rebase error from change log
Merge pull request #3433 from edx/ahodges/documentation/changelog

Removed rebase error from change log
Merge pull request #3431 from edx/sylvia/docs/DOC-263

Update screenshots and add feedback prompt info
Added process documentation
Refer to process docs in CONTRIBUTING.rst
Make TinyMCE more tolerant about HTML elements

STUD-1565
allow capa poroblems access to anonymous_student_id

fix system->capa_system in capa_problem change for anonid
Fixed toggle cheatsheet not working on component editors.
STUD-1514
remove location of item from loc_mapper and cache
Merge pull request #3368 from edx/waheed/stud1514-toggle-cheatsheet-not-working

Fixed toggle cheatsheet not working on component editors.
Merge pull request #3250 from edx/zub/bugfix/std1441-editdiscussioncomp

remove location of item from loc_mapper