Basically working with Ember pre4, except where it's broke.
Bundle update.
Test shenanigans.

Found an Ember issue here that is responsible for some integration test
failures: https://github.com/emberjs/ember.js/pull/1571
Manually patching the framework sucks, but it's better than not having
integration tests!

Upgraded Capybara and needed to move integration tests to spec/requests.