Rudimentary patching of Marionette.Application

Not doing anything with it yet, but you should see a "new" "Application" event when logging the inspector tab.
Yep. This has the potential issue that if window.Marionette and Backbone.Marionette are both defined, but different, one will be arbitrarily chosen, but that should never be the case (and if it is, the user has worse problems)