Upgrade Video.JS to 7.5.5
Upgrade videojs-youtube plugin to 2.6.0
Upgrade videojs-flash plugin to 2.2.2
Added additional AMD modules for bootstrapping the DOM
window and document objects to Video.JS in line with the
updates made to Video.JS.
The videojs javascript is over 1MB of javascript which we don't need to
load on every page, now that we only require it demand, the js can be
lazily loaded when its needed, which keeps the first.js smaller and more
likely to stay in browser cache.