documentcloud/backbone — pull request #936 by braddunbar (2012-02-02 16:01:19+00:00)
Title: fixes #915 - nested `'change:attr'` events

* `'change'` does not fire without changes
* nested `'change:attr'` events are fired
* `'change'` is only fired once for nested calls
* nested `'change'` events are fired