Swarm plugged

Basically changes in the model and collection. Method sync changed
locally for each instance.
Demo: http://swarmjs.github.io/todomvc-backbone-swarm
Video: http://www.youtube.com/watch?v=ZIwqWo349Uc
How it works see:
- https://github.com/gritzko/swarm/blob/master/lib/BackboneCollectionMixin.js
- https://github.com/gritzko/swarm/blob/master/lib/BackboneModelMixin.js