User info on profile

https://trello.com/c/G5ZpuB4N/47-user-info-on-user-show-page

![image](https://cloud.githubusercontent.com/assets/8669803/5114170/5627a3fc-7004-11e4-920e-c1d4547b7471.png)
How can the `root_path` show data specific to a user?