remove old version of codemirror, to prevent confusion
Fix for CourseFactory bug - course object not saved after setattr called
Bugfix for split test on sequential save

Bug would occur when comparing Groups or UserPartitions - because these types
lacked comparator methods, different objects would come up as different when
their values were equal.
Do not remap the wiki_slug if reimporting into the same course.

LMS-2136
Merge pull request #2889 from edx/sarina/fix-abtest-for-sequentials

Bugfix for split test on sequential save
adjusted visual styling for editing state of xblocks, html, and video components which had extra padding applied to it from the container page xblock styling
STUD-1410
Merge pull request #2902 from edx/usman/lms2136-wiki-slug-renamespacing-fix

Do not remap the wiki_slug if reimporting into the same course.
Fixed module urls creation in legacy instructor dashboard.

LMS-2327
BLD-915: Fix issues with different videoIDs.
Upload files explicitly in tests.
Merge pull request #2906 from edx/anton/fix-for-different-videoids

Video: Fix issues related to videos that have separate YouTube IDs for the different video speeds.
Merge release-2014-03-12 back to master.

https://edx-wiki.atlassian.net/wiki/display/ENG/Release+Page%3A+2014-03-12