Fix section release acceptance test failure.
Merge pull request #402 from edx/peter-fogg/fix-section-release-tests

Fix section release acceptance test failure.
Studio: revises nav display issue by re-scoping poor Updates Sass rules
Studio: renames and re-orgs app-wide Sass extends
Studio: references newly renamed app-wide Sass extends
Studio: adds further comment/prefix revisions to Sass extends
Studio: renames and simplifies .cont-trucated Sass extend
Studio: renames nav dropdown pattern and corrects references
Studio: updates Sass mixins/extend references based on textbook/Sass cleanup
Tweak behavior of submit buttons on register and login pages

The buttons are not re-enabled if the registration/login submission succeeds
(and, therefore, the user is about to be directed to another page). Also, any
error message that is present does not disappear immediately before the page
redirects.
Reinstate problem_check event as Problem Checked event
Merge pull request #393 from edx/talbs/studio-nav-fix

Studio: Revises Course Updates Nav Visual Display Issue
Merge pull request #319 from edx/talbs/studio-sassmixins

Studio Sass Mixin/Extend Re-Org
Remove unused code and include problem ID of data we send
Make DraftModuleStore mongo only

DraftModuleStore was originally designed as a mixin, but never used that
way, and with the upcoming changes to use the versioned module store,
never will be. This changes removes a circular dependency between
mongo.py and draft.py.
Update MathJax to the latest stable version (2.2), to fix IE10 bug LMS-194
Merge pull request #406 from edx/gprice/register-button-enabling-tweak

Tweak behavior of submit buttons on register and login pages
Merge pull request #412 from edx/dave/ie10_mathjax_fix

Update MathJax to the latest stable version (2.2), to fix IE10 bug LMS-194
changed transifex project to edx-platform
Merge pull request #414 from edx/jtauber/switch-transifex-project

changed transifex project to edx-platform