Pswadi/flowdock integration

Sends out notifications to the configured flowdock to request approval for buddy request.
Also, fixed the issue of checking pending deploy rather than stage.
/cc @zendesk/samson 

### References
https://github.com/zendesk/samson/pull/104

### Risks
 - None
![screen shot 2014-09-17 at 11 01 29 am](https://cloud.githubusercontent.com/assets/7716723/4308631/b18a7bd0-3e94-11e4-99ad-7c7be2175a22.png)
Don't like this. Why distract the whole team in a flow for a deployment? Shouldn't deployers have a buddy before they click the deploy button? If anything this should be a flowdock notification which a team member could bring to others attention.