Email Logins

You can sign up and log in with an email address.
Still working on the UI.

Existing UI:
![screen shot 2014-03-20 at 1 25 08 am](https://f.cloud.github.com/assets/499821/2469139/0d2476aa-aff0-11e3-902b-ce470205438c.png)
![screen shot 2014-03-20 at 1 25 00 am](https://f.cloud.github.com/assets/499821/2469138/0d237c0a-aff0-11e3-9f7c-afde2b641921.png)
![screen shot 2014-03-20 at 1 33 44 am](https://f.cloud.github.com/assets/499821/2469170/4be77f26-aff1-11e3-86c9-f44718f20fa6.png)


Working towards (as discussed with @divad12):
![screen shot 2014-03-20 at 1 23 00 am](https://f.cloud.github.com/assets/499821/2469143/285d2fca-aff0-11e3-94b3-4cf2c3ab4533.png)