Paginate posts on area show page

https://trello.com/c/doxGxlHJ/17-as-a-user-i-can-view-posts-in-a-paginated-list
![screen shot 2014-11-06 at 3 22 11 pm](https://cloud.githubusercontent.com/assets/8681076/4943241/aaaeb2e2-65f2-11e4-9578-0b09189968dc.png)