Bug/christina/mktg urls

LMS Sass Variable/Background Color Fixes

Revert accidental push of changes to master

Video tests fix

updating mktg defaults in common.py

This reverts commit e9c5d765, reversing
changes made to 5ff9f3be.

read MKTG_URLS from env.json

Skip a test that is causing intermittent failures due to the way it is ordered.

Will/fix rake test

Removed cleaning of reports folders, since this was
interferring with coverage reports generated
sequentially by rake test.

Developer-private settings files

Developers can have private settings files by creating
lms/envs/private.py or cms/envs/private.py.  They are imported
at the end of dev.py.  Note that they won't be imported if you
are using one of the other dev*.py variants.

Re-insert "if in course" check for displaying paragraph about forums.

Accidentally got removed in pull request 13.

Will/diff cover integration

[STUD-244] add exporting of 'about' content as well as adding unit test checks

seems like there's a Django bug and the SESSION_COOKIE_NAME needs to be ...

LMS theming for Stanford 6/11/13 launch

theming - revised variables and link/button styling to account for edX's registration and login constrast/styling changes

Minor stylistic tweak.