Enable and disable draw buttons (and functionality)

Example:

````
var drawControl = new L.Control.Draw({
	position: 'topright',
	polyline: false
});
map.addControl(drawControl);
````

Disable button and functionality:

````
drawControl.disable('circle');
````

Enable button and functionality:
````
drawControl.enable('circle');
````
Removed a console.log()
jshint changes