do not force default 300x150 if no width/height found
proper vertical-align on default skin
use {width: "auto", height: "auto"} to let css decide video dimensions
Merge branch 'optional_resize' of github.com:mente/video-js into optional_resize

* 'optional_resize' of github.com:mente/video-js:
  proper vertical-align on default skin
vjs.Component.dimension accepts 'auto' as value
test case for vjs.Component.dimension with 'auto'
Merge branch 'optional_resize' of git://github.com/mente/video-js into mente-optional_resize closes #359

Conflicts:
	test/unit/component.js
Merge branch 'master' of github.com:zencoder/video-js