Extends

A method to extend classes in Javascript.

Features:
- super method calling this._super()
- static properties
- object cloning with this.clone()

Examples:

``
var Class = function() {};

var Stuff = extend(Class, {
statics: {
COLOR_RED: 'red',
COLOR_BLUE: 'blue'
},

setColor: function(color) {
this.color = color;
}
});

// extended classes will have a .extend method
var Ball = Stuff.extend({
setColor: function(color) {
this._super(color);
this.updateBallColor();
},
updateBallColor: function() {
// do something
}
});

``