organized html courses, start html video course
removed elements to match course start document
video and audio examples added
closed captioning added
not working
found mistake in media player
custom video skin and replaced a missing file

Also fixed the video centering issue, which was related to not using
the “.mejs-treehouse” class and using my own.  The tutorial never
talked about that selector in the main.css.
Merge pull request #3 from alexfriant/html-audio-video

Html audio video