Fixed scope bug for push() method.  Also added ability to set two new
properties on the store that allow a developer to specify the class that
and method that creates a JSONStore collection, if one has not been
specified with set("collection",collection).  This is useful in
dojox/app based applications, where you can now add those additional two
properties to the store definition in config.json
Merge branch 'master' of https://github.com/ibm-dojo/dworklight.git