Users can edit, update, and delete surveys, and error messages are rende...

https://trello.com/c/tzlGunnW/7-as-a-user-i-can-update-surveys
https://trello.com/c/6WtJWr1L/11-as-a-user-i-can-delete-my-surveys

![screenshot from 2014-11-11 11 34 33](https://cloud.githubusercontent.com/assets/8154429/4996655/ba58f778-6996-11e4-831b-0cc5ec684829.png)

![screenshot from 2014-11-11 11 33 44](https://cloud.githubusercontent.com/assets/8154429/4996667/c207b0fe-6996-11e4-96b2-1323c1f753fc.png)

![screenshot from 2014-11-11 11 34 10](https://cloud.githubusercontent.com/assets/8154429/4996669/c56ea45a-6996-11e4-96ab-50dae7ecec1a.png)

No instance variables in partials