Change /community to a list 

This turns the community page into a list. We have so many now that the avatar wall isn't that helpful. I don't even think we need a 'switch to avatar wall view' option, I think we can just go with list from this point forward. This is a super simple Bootstrap list implementation of our data.

It might be nice to have the list better organized (other than just country/group) but this is the easiest to ship version. Maybe later we want to think about getting more info in the data. 

![screen shot 2014-05-21 at 9 38 58 pm](https://cloud.githubusercontent.com/assets/1305617/3045878/0fe95456-e122-11e3-8dfc-73bca53f0e6c.png)