"Who Am I?" – log in with Personas

Pivotal Tracker ticket [#75075362](https://www.pivotaltracker.com/story/show/75075362), "As a City stakeholder, I want users of this system to have to log in before they can see any sensitive data."

Known TODOs:
- [ ] write tests
- [ ] resolve merge conflicts with master
- [x] prevent users from accessing pages besides '/' if they're not logged in
On this point, it looks like there's at least some kind of timeout going on, and when you come back to a window after a while, you get this page that isn't too helpful. 

https://www.dropbox.com/s/8v5jrm7mzv7gvpc/Screenshot%202014-08-19%2016.05.16.png?dl=0