Compat fixes for Backbone@1.0

@megawac discovered some incompatibilities with Backbone 1.0

https://travis-ci.org/marionettejs/backbone.marionette/jobs/40253385
https://travis-ci.org/marionettejs/backbone.marionette/jobs/40253386
Still so weird. And IIRC this also causes the function to be deopt'd in most cases.