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...
```

Well, it's like casting to `(bool)` in php, but so much uglier :) Standards are not always good!  :panda_face: 
I still think `deploy == null` is so more readible, you disagree? I would be ok with `!deploy`, but doing extra call sounds not right! :)