Initializer deprecations

Getting the following deprecation:

```
DEPRECATION: `lookup` was called on a Registry. The `initializer` API no longer receives a container, and you should use an `instanceInitializer` to look up objects from the container. See http://emberjs.com/guides/deprecations#toc_deprecate-access-to-instances-in-initializers for more details.
```

Will try to put in a PR soon.
