Don't pass[word] me by... (or Added authentication and temporary admin interface)

Added *Devise* and *Active Admin* for authentication and for initial sys admin screens (eventually replaced with cleaner tech director view when there is more time).

@codesliced Ready for review. Still working on the authorization part, so I'll still need this branch for that (I'll keep it synced with the `master` branch).

![screen shot 2014-05-14 at 5 38 40 pm](https://cloud.githubusercontent.com/assets/950486/2979252/b8055350-dbc9-11e3-803f-63d75b7f379e.png)
![screen shot 2014-05-14 at 5 40 24 pm](https://cloud.githubusercontent.com/assets/950486/2979253/b807dd8c-dbc9-11e3-8a10-4867783f032a.png)