The customRenderer attribute isn't read only

This attribute commented as read only on the API document,
but it was actually not read only. Fix #932.
Merge branch 'fix-932' into live-docs
Added implementation of _isHidden for browsers that don't have hasAttribute. (ie 6,7) Fix #1080.
Moved updated _isHidden from node-ie to node-view.
Need to add the changes to node-view.
Build Calendar, no -min changes
Merge branch 'live-docs' into dev-master

Conflicts:
	build/calendar-base/calendar-base-coverage.js
Build Node