not using fullscreen API in IE11

[erik-anderson]

IE11 added support for the W3C Fullscreen API, but video.js isn't calling it. This makes videos only go full-window rather than fullscreen.

Documentation is available at http://msdn.microsoft.com/en-us/library/ie/dn265028(v=vs.85).aspx.

It's as simple as calling element.msRequestFullscreen to enter and document.msExitFullscreen to exit. To listen for changes to fullscreen state, listen to MSFullscreenChange.

[erik-anderson]

My apologies; this is a duplicate of issue #673.