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...
```

I'm not sure whether we need to remove `set/getDeploy`. How do you suppose to use `deployMonitor` without them? We need to store instance of `deployMonitor` between execution of separate Hipchat commands. As I can see it now having the instance `deployMonitor` from the beginning is more readable.