Better development environment

Finally added auto-watch and re-build features for development environment.

With this change every time we modify a file in our app it will automatically re-create the build and notify you with a desktop notification. Refresh to see your changes in the browser.

Just run `./katuma.js` to see it in action!

![](http://media.giphy.com/media/1u1J4pjT2nvYQ/giphy.gif)