When JS functions are defined with names, they are local variables, and inaccessible
if defined inside a closure. Django-Pipeline concatenates all of our JS into one
big closure. This function explicitly assings the function to a property of the
`window` object, so that it is accessible to other JS functions.

Mocked loading of captions.
Fixed remaining tests in captions.
Fixed failing tests in speed control, and quality control. Turned off all VideoAlpha tests because browser crashes when all are run at once. To check that they are passing, go through each file one by one, replacing xdescribe with describe. Dont forget to change back to xdescribe when the test was run and turns out to be OK.
Some tests at the end of video_player_spec.js pass
Further fixing tests in video_player_spec file.
transfers changes to test_logic from master to __init__ and other files
Fixing more tests.

http://epeli.github.io/underscore.string/

This reverts commit 90a9c386.

Backbone 1.0.0, Underscore 1.4.4

changing default timeFormat within datepair.js for instances where the plugin is called by default HTML classes