Popup liveblog

![screen shot 2014-09-30 at 10 59 23](https://cloud.githubusercontent.com/assets/4549425/4456260/874f572a-4888-11e4-85df-d932fd159e14.png)

I renamed the nav popup to popup. In it's current state it's not greatly reusable, but it's a step closer to a general popup/dropdown thing.