Cite ui 992

towards #992. When I actually looked at the citations we had on the old site they seemed to fall short in a number of ways: Most notably, they didn't include the URL. The point of a citation is to enable later readers to relocate an item: Leaving out the URL makes no sense.

That said, I'm really not that confident that this way is perfect either.

![screen shot 2014-12-16 at 6 11 47 pm](https://cloud.githubusercontent.com/assets/730388/5463896/0ea5d9da-854f-11e4-8ee2-a35b69cdc03b.png)