Browse Exhibits

Fixes #66, #68.

![screen shot 2014-02-05 at 8 09 15](https://f.cloud.github.com/assets/111218/2088836/ed4524e2-8e7f-11e3-8735-c630a6fcda32.png)
![screen shot 2014-02-05 at 8 09 27](https://f.cloud.github.com/assets/111218/2088837/ed453798-8e7f-11e3-8f61-9ffa55366420.png)