Fix repeated doc builds
Make builds quiet by default
Fix notification problem
Add verbose option
Fix import mocks.

    Prevents sphinx from bailing on builds that involve unavailable imports.
Add in and route control options
Fix defaults
Fix tests
Fix self assessment test
Address review comments
catch error in delete_course management script when group does not exist
Fix initial loading bug.

Change the `MathJax.Hub.Queue(initializeRequest)` to a simpler function call
(`initializeRequest.call(this)`). This was failing to give a proper context
to initializeRequest, and `this.value` was turning up as `undefined`.

Also add a fallback if we need to display some code before MathJax finishes
its original typesetting.

I was stubbing out `Queue` in my specs, so the tests had to be changed around
a little.
Make split mongo read-only API consistent with other modulestores.
Make it clear that get_course_for_item is only a helper method in mongo modulestore.
Add get_instance method.
pylint/pep8 cleanup.

cleanup.
Add filter for playback rates.
Fix error seen in combinedopenended modules
Merge pull request #681 from edx/sarina/hotfix/fix-combinedopenended

Fix error seen in combinedopenended modules
turn off i18n