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
```js
function foo(options) {
  options = 'bar';
  return arguments;
}
foo('foo');
// >> ["bar"]
```