ADD handle custom event parameters

Darwin did not handle custom event parameters, previously. If you did
something like that :

```coffee
$('#foo').trigger( 'bar', [ 'hello', 'world' ] )
```

... additional arguments would simply be discarded. They are now pass
after element and event :

```coffee
class App.Controllers.Foos extends Darwin.Controller
  @options {
    events:
      'Handle my custom event': { el: 'foo', type: 'bar' }
  }

  foo_bared: ( $element, event, first_word, second_word ) ->
    console.log( first_word, second_word )
```

Related : #1