clone() objects are not retaining properties

I noticed this in my own code but you can actually see the effects of this problem in the docs example here:

http://ocanvas.org/docs/Display-Objects/Base/clone

There is only one black rectangle when there should be two. If the example code is edited so that:

```
var rectangle_2 = rectangle_1.clone({
    x: 77,
    y: 190,
    width: 200,
    height: 100
});
```

The rectangle will now appear.
