Added Dploy.io integration

This integration shows when a deployment start and ends on [Dploy](http://dploy.io/).

To setup the webhook url generated by Hammock must be added to the pre- & post-deploy hooks.

Example:
![Dploy Integration](https://f.cloud.github.com/assets/1090754/2518502/f6308708-b464-11e3-8ef9-a9898dd0554c.png)