Simple public view using existing dashboard

Instead of a complicated workflow, here's a simple quick solution. If the user isn't logged in, let's show a dashboard with fewer controls:
![2014-08-20 01 26 54 pm](https://cloud.githubusercontent.com/assets/86435/3985210/3ea7c836-288f-11e4-907c-8e71013f1590.png)

Next steps: 
* Let authors write survey descriptions / intros
* Record survey organization (who it was built by)
* Better descriptions for questions