User can add comments to dive sites

https://trello.com/c/iLcebMlJ/4-as-a-user-i-can-submit-new-information-details-descriptions-notes-etc

![image](https://cloud.githubusercontent.com/assets/8681076/5360186/b2591502-7f90-11e4-86f0-5f90cc00b231.png)