refactoring of platform to xblock 0.3 w/ refactoring of inheritance in the platform to a consistent representation.

Include mixins in advanced component class loading and preview modules

Fix nopathtoitem error

update mitxmako lookup / fixes FOR-150

Updated static-pages test to add retry logic

Dependency warning message on requirements files

Provide CAS authentication integration

update mitxmako lookup / fixes FOR-150

Adding debugging messages for Video player.

Valera/video single yt xhr jasmine test

Removed extra check for console.log() existance. Modified error
messages. Formatted entire file to fit in 80 lines or less.

Formatting files so that they fit under 80 lines. Adding debug info for
what type of YouTube video player is being used. Also comment on whether
playbackRates is available for HTML5 mode.

Changed back Anton's original function _checkPlaybackRates(). Now logging for
this function's result is done only on error (in the function that is invoking)
it).

For now outputting main flow of loading YouTube or non-YouTube videos.

Forgot to include local variables in var statement.

Must clear the state youtubeXhr variable before counting number
of ajax calls.

We test for the number of ajax calls made when there are 3
videos on the page.

Speed button know behaves like the volume button when tabbing forward or...

Added test to verify that there is a certain order in the controls -- tabbing on the speed control will malfunction if it is not the case.

Added focus tracking to play/pause button. This fixes a bug where the tabbing, in certain condition, would get stuck on speed button.

Fix capa optioninput template to honor inline flag

Don't show course about page link when we have the marketing site.

vagrant: Add flag to ensure install is completed at least once

STUD-733

due to the MixedModuleStore pending release, we need to make enrollment ...

due to the MixedModuleStore pending release, we need to make enrollment start/end dates editable in Studio

The provisioning script used to check for the existence of the
`/opt/edx/node_modules` folder to decide if the installation has already
been completed. However, since additional instructions were executed
by the installer afterwards, any installation error (eg. download
timeouts on low quality connections) happening between the creation of
that folder and the end of the installation wouldn't be recovered from
on the next vagrant instance boot.