Squashed commit of the following:

commit 805ec80ef78387779c65c3cebbea179a2fddfe8c
Author: Colin Snover <github.com@zetafleet.com>
Date:   Wed May 28 18:56:35 2014 +0000

    Pass change notifications to legacy observers

    This works when the adapted store is a dstore/Observable and the
    adapted store is also wrapped in a legacy dojo/store/Observable.