Add UI to control WebHook Triggers

- Working radios that allow you to select which step you would like your web-hook to fire on (test, deploy).
- Listeners are registered and removed based upon job type

ScreenShots:
![screen shot 2014-08-10 at 1 45 42 am](https://cloud.githubusercontent.com/assets/2414138/3868677/ebb4e8c0-205a-11e4-8e00-f283de331620.png)
![screen shot 2014-08-10 at 1 47 15 am](https://cloud.githubusercontent.com/assets/2414138/3868678/ef696b4e-205a-11e4-85aa-839bd3e2ec22.png)