Bdm users can view other users histories

https://trello.com/c/H6IlguvS/18-as-a-user-i-can-see-all-of-another-user-s-posts

![image](https://cloud.githubusercontent.com/assets/8669803/4926394/2095899c-6533-11e4-9079-78421f978750.png)

![image](https://cloud.githubusercontent.com/assets/8669803/4926413/4946f632-6533-11e4-8aec-981e823efe66.png)

I don't like reaching into the user object for the email here. Could you make a "user_link" partial that you pass the user into?