use Marionette's event hashes for Model and Collection events

refer to Marionette's documentation for more details https://github.com/marionettejs/backbone.marionette/blob/master/docs/marionette.view.md#viewmodelevents-and-viewcollectionevents
Merge pull request #545 from thebakeryio/feature/backbone-marionette-model-shortcuts

use Marionette's event hashes for Model and Collection events