Esc users can edit and delete listing

[trello-update](https://trello.com/c/dWViw2ua/5-as-a-user-i-can-update-my-listing)
[trello-delete](https://trello.com/c/tT9u8hod/8-as-a-user-i-can-delete-my-listing)

![image](https://cloud.githubusercontent.com/assets/8655639/4984237/edbd6d3a-6921-11e4-9d88-0357bd5b6afa.png)

This isn't returning a user, it's returning listings. How about `load_listings_from_url` instead?