Fixes #3409
Bok-Choy video tests batch2
Reword docstrings for bok-choy video tests
Merge pull request #3425 from edx/pk-set-can-be-none

pk_set can be None
Remove cruft from user profile threads

This removes the vote button from threads on the user profile, which was
the only interaction available on the page other than the link to view
the thread in the main discussion view.
Merge pull request #3341 from edx/ammar/bok-choy-video-tests-batch2

Convert video tests from lettuce to bok-choy - batch 2
Release notes draft 4-23-14
Merge pull request #3430 from edx/markhoeber/documentation/doc-273

Release notes draft 4-23-14
Add pagination to forum user profile page
properly remove users from instructor/staff groups on a course delete
STUD-1555
Merge pull request #3304 from edx/zub/story/deletecoursegroups

properly remove users from instructor/staff groups on a course delete
Set initial video quality to large instead of default to avoid automatic switch to HD when iframe resizes. [BLD 981]
Separate each problem type into its own file

Separate all exercise and tool types, and create a new folder to contain them.
Merge pull request #3360 from edx/DOC-224

Doc 224
Merge pull request #3447 from edx/jmclaus/bugfix_hd_button_activates_by_itself

Set initial video quality to large instead of default to avoid automatic switch to HD when iframe resizes. [BLD 981]
Typo corrections
Merge pull request #3453 from edx/sylvia/docs/DOC-224

Typo corrections
DOC-115 adds topics to make data interpretation easier
Merge pull request #3287 from edx/ahodges/documentation/DOC115

Ahodges/documentation/doc115
Removed trailing periods in two scenario names