Allow setting a custom incompatible video message. fixes #636
Default incompatibility msg w/ other global options fixes #636
Merge branch 'master' of https://github.com/videojs/video.js into 636-incompatible
Merge branch '636-incompatible' of git://github.com/jelbourn/video.js into jelbourn-636-incompatible

Conflicts:
	test/unit/player.js
Added a line to the changelog