Login

Plumbing
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* Create Login controller to govern the session around login and logout. 
* Hook up Application controller to check the authentication every time.
* Created Auth Route (will be the parent of all routes that needs Auth to operate)
* Store the token and user info in the session

TODOS
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* Use more permanent storage then a controller (localStorage, cookie, etc.)
* Send back the token on all requests as part of the header.
* Hook in `logout` call to server.

Depending on https://github.com/CrazyHorseHQ/smart_app/pull/31
async, so yeah, one thing to address there.