Allow course staff to masquerade as students in viewing courseware

Feature/will/update testing docs

Feature/kevin/pinning inline

Make updates to the MatlabInput InputType

when updating the list of children of sequentials, we must use the 'dire...

Correcting placeholder text for grace period field in course settings

when updating the list of children of sequentials, we must use the 'direct' store otherwise we end up with draft revisions of sequentials, which is bad

Press Releases: generic matching rule instead of explicit lines in url.py

blocked from courseware pages, if course hasn't started yet)

Updated jasmine rake documentation to reflect changes Cale made

Fixed mistake in pip install snippet

* Hide "Test Code" button after we check the problem
* Only set the state of the problem to 'queued' if we have successfully
queued the problem
* Unit tests for bugs and new functionality

Upgrade lettuce and factory boy versions, fix CMS lettuce tests to run under phantomjs or tag them to skip