FLUID-4826: Slight refactoring of aira tests.

Modified the Video PLayer Aria tests to use the initVideoPLayer function from the testutils and switched from doing an assertTrue to assertValue when checking if the aria-controls attribute is added.
FLUID-4826: updated the ToggleButton's onReady

Changed the onReady event of the toggleButton component to fire after the onAttach event of the tooltip and it's own onCreate event have fired.
FLUID-4826: Updated onReady for the languageMenu

Updated the onReady to fire after the onCreate and afterRender events have fired.
Merge remote-tracking branch 'upstream/master' into FLUID-4826
FLUID-4853: With youtube videos, the video duration is not returned at the initial load, in which case hide the scrubber handle that displays this information. The duration is available when the video plays. At then, update the duration and display the scrubber handle.
Merge branch 'master' into FLUID-4853
Merge branch 'master' into FLUID-4826
FLUID-4853: Fixed some failed tests.
FLUID-4661: Fix to properly update model after fullscreen exited via ESCAPE key
FLUID-4661: Make the fullscreenchange event conditional, so IE doesn't throw an error.
Merge branch 'master' into FLUID-4826
Merge branch 'master' into FLUID-4826

Conflicts:
	tests/js/VideoPlayerAriaTests.js
FLUID-4826: Replaced onReady event injection

Replaced the event injection for the onReady events used in the VideoPlayer_controllers.js file as there is an issue with injecting aggregate events (see: FLUID-4879).
Merge branch 'FLUID-4826'

* FLUID-4826:
  FLUID-4826: Replaced onReady event injection
  FLUID-4826: Updated onReady for the languageMenu
  FLUID-4826: updated the ToggleButton's onReady
  FLUID-4826: Slight refactoring of aira tests.
NOJIRA: Merged in the master branch.
Merge branch 'master' into FLUID-4853
FLUID-4853: First implementation of the showHide grade component.
FLUID-4853: A more robust way to compose model EL paths.
FLUID-4853: Improved showHide grade to support hiding and showing by using the component selectors.
FLUID-4853: Make use of showHide grade to show/hide the scrubber handle.