A large refactor brining the adapter up to date with Ember-Data

* Update Ember and Ember-Data
* Up the QUnit timeout to something reasonable
* Point bower at the vendor/ directory
* Add a geo transform
* Add a file transform
* Login and signup do not manage the session token or current user
* Login and signup accept ad-hoc data, allowing for social signup calls
* Add a parse-date transform
* Provide a sessionToken property on the adapter