AGJS-41: vert.x notifier cookbook sample

Can you take a look?

I need certainly to do some polishing:
[ ] readme
[ ] comments
[ ] code style?

I have few other concerns:

* should I remove development files such as Gruntfile.js?
* need to remove tests (or update them to work), but they won't be useful without `$ grunt test`
* should I squash commits to just one?