Killpack/auth *WIP* *WIP* *WIP*

WIP.

It's gonna work like this:
- You type in your username and password, which hits the `authorizations` endpoint. On successful authentication, it returns your auth token.
- Ember stores this auth token somewhere and uses it to make requests from thereon out.
Is there an "Ember way" to write this? Maybe in emblem something like (dunno if this works):

```slim
link-to 'logout' logout
  Logout