[MEDIA] Updates to MAUR

I have pushed the MAUR updates to the git repo.  They are NOT in the
gh-pages branch, so the easiest way to view them is at
https://rawgit.com/w3c/pfwg/master/media-accessibility-reqs/index.html

I have not yet updated the comment responses.  I will do that shortly.
John, we need the checklist updated so it is in sync with the main document
and then we can close the loop with the reviewers.

-- 
Shane McCarron
Managing Director, Applied Testing and Technology, Inc.