Spam can be unmarked

https://trello.com/c/OC71NU4i/27-as-an-admin-i-can-unmark-posts-as-spam

![selection_017](https://cloud.githubusercontent.com/assets/8248100/5019213/71b3b30a-6a8b-11e4-8f8a-3bddfe39f866.png)


Perfromed `db:drop` and then `db:migrate` and nothing changed. Moreover these lines aren't even in my schema so I'm not sure why they're appearing on git. I'm choosing to ignore this until the time comes to rebase onto master as none of my local code is affected.