Fix Ember 1.0 object.create violations in ResourceCollection

This diff is a little bit hacky, so I'm not sure it's something we want to do, but basically: if the superclass's createWithMixins method is available, we use that. Otherwise, we're in 0.9.8.* and can just use the superclass's create (as this._super).

This fixes the ~17 Ember.Object.create violation warnings when you attempt to do anything with a ticket in lotus.

(The grosser alternative I found, for the curious: replace `this._super.call(this, options)` with `this._super.call(this.extend(options), {constructor: this})`. Because that constructor needs to be correctly set for the cache.)