Can't get a BUTTON dom element s value attribute properly in IE7
[DOM] Move fix to DOM part of YUI. Unit test added to cover the case
Merge remote-tracking branch 'popox/ie7-getAttribute' into dev-master
Build DOM.
Merge remote-tracking branch 'upstream/dev-master' into dev-3.x

Conflicts:
	build/dom-base/dom-base-coverage.js
	build/dom-base/dom-base-min.js
Resolve build conflicts with `dom-base-coverage.js` and `dom-base-min.js`.