Users can view their favorite listings

[trello](https://trello.com/c/ugWuUSgs/25-users-can-view-their-favorite-listings-liked-listings)

![image](https://cloud.githubusercontent.com/assets/8655639/5019196/4e84d486-6a8b-11e4-825a-95301037fbf9.png)
Why are you passing current_user to the path?