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...
```

Let's simplify this class by not returning instance here - just class.
Then in usage we can bascically create instance of DeployMonitor and start listening from start. This would allow us to remove `set/getDeploy` methods.