Introduce automated development process using Grunt

Hi,

I'd like to introduce to you a refactored project structure, fully automated by [Grunt](http://gruntjs.com/).

The intention behind this is to have a development environment which takes care of compilations, minifications, test, etc and gives you more time to focus on the development itself. Using Grunt you can define a series of tasks that do exactly those things.

So now, for example, you can do `grunt build` and you get the sources compiled, minified and copied into specific folders, or you can run the tests with `grunt test`.
With `grunt run` you get a small static server running and opened on the browser to the doc/demo page, listening to changes of the coffeescript and reloading automatically the page after that.

The new folder structure is like that:

````javascript
Root folder
|-- build // generated sources
|-- docs // contains the demo page
    |-- assets // contains all resources
    |   |-- css
    |   |-- img
    |   |-- js
    |   |-- vendor
|-- src // development files
    |-- coffee
    |-- less
|-- test
    |-- build // generated spec sources
    |-- spec // contains all specs
```

For more detailed infos, have a look at the README.

What do you think? I hope this will help to improve the development process. 
For any question, feel free to ask :)

Cheers