Event Gestures: Addition of IE 11 to `should ignore` condition.
[node-view] Use 'hidden' as the attribute's value

Even though the attribute's effect gets activated for any value of the
attribute, this way it's easier for anyone looking at the DOM to figure
out what the visibility of the node is.
[node-view] Document node._isHidden
YUI and Loader build for latest Gallery build
Merge branch 'node-hidden' into dev-master