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've noticed that in all respond regexpes you use trailing `$` to limit the line, but never `^` prefix. Is that for reason?
It could lead to some unexpected responses like: `I could neve cancel deploy` - `No deployment to cancel` :)

Or you did it on purpose to allow saying:
`Dear Mr Hubot, please deploy sk production` :panda_face: this is worth it :)