adds in collapsible metadata panel

There are still some issues with `height` being set correctly. See #83

Also needs to only show metadata sections when they are actually present see #81 . I think some design guidance may be needed here as well.

Buttons styles are added in, should be able to be modified easily.

Related to #66 

![screen shot 2014-10-16 at 1 52 18 pm](https://cloud.githubusercontent.com/assets/1656824/4670356/5e18ca8a-5576-11e4-9c4d-2257d054c78b.png)

![screen shot 2014-10-16 at 1 52 24 pm](https://cloud.githubusercontent.com/assets/1656824/4670363/620e2eb4-5576-11e4-811b-0e8ab6c16f23.png)