Caching collection requests.

 On branch dashboard_ent_caching
	deleted:    app/assets/javascripts/backbone/lib/concerns/entity/collection_fetch.js.coffee
	deleted:    app/assets/javascripts/backbone/lib/concerns/entity/model_fetch.js.coffee
	modified:   app/assets/javascripts/backbone/lib/entities/cache.js.coffee
	modified:   app/assets/javascripts/backbone/lib/entities/collections.js.coffee