Making additional ModelRefController features mixins.

[edchat]

This started out with pull request 62 from asudoh.

#62

Please See that pull request for the initial details.

[edchat]

My latest commit to the mixin branch: https://github.com/edchat/dojox_mvc/tree/mixin
72bfc9d

Renamed the mixins to EditControllerMixin.js, StoreControllerMixin.js and ListControllerMixin to make the names consistent.

Now I want to take a look at the api's and see if there are places we can make some of those more consistent too.

[edchat]

Christophe thinks it should be even shorter names, EditMixin.js, StoreMixin.js and ListMixin.js