Replace `check_for_get_code` with `assert_request_status_code`

More flexible, uses the word "assert", method instead of function
Added enrollment breakdown by certificate track
Updating ORA2 hash for hotfix August 5th, 2014
Refactor LMS Video Tests
Decrease Video Player Init Wait Timeout
Merge pull request #4709 from edx/ora2/hotfix-2014-8-5

Updating ORA2 hash for hotfix August 5th, 2014
add space to table header
make expanding explanation accessible

LMS-11161
Toggle aria-expanded attribute
Implemented process_response method to clear requestcontext global variable in mako middleware.
LMS-6622
Request IFRAME API every time with https scheme.
Merge pull request #4718 from edx/cdodge/fix-visual-bug

add space to table header
Merge pull request #4719 from edx/waheed/lms6622-implemented-process-response-method-rc

Implemented process_response method to clear requestcontext global variable in mako middleware.
Separated August changes into new table in chg log
ORA2 hotfix 2014-08-06
Merge pull request #4722 from edx/will/ora2-hotfix-2014-08-06

ORA2 hotfix 2014-08-06
Merge pull request #4715 from edx/ammar/decrease-video-player-init-timeout

Decrease Video Player Init Wait Timeout
Merge pull request #4261 from edx/ammar/video-tests-refactoring

Refactor Bok-Choy LMS Video Tests
Fix property call issue
Merge pull request #4731 from edx/ammar/fix-property-call

Fix property call issue