deploy: print last output line if no change in 10 seconds

Depends on #14. Merges #15.
If `deploy`'s output didn't change for 10 seconds, then print the last line of output to the chat.

```
Running 10 secs: <Last line of output>
Running 20 secs: <Last line of output>
Continuing...
```

Oh, isn't this too much?
It will remove other listeners like those from deploy.coffee https://github.com/vogdb/hubot-pulsar/blob/issue-12/src/deploy.coffee#L23

What do you think about namespacing those events. I see that basic node EventEmitter doesn't probide this functionality. What about https://nodejsmodules.org/pkg/eventemitter2 ?

Discussion more than welcome.