Destroying droppedPanel produce errors

[aebsubis]

Uncaught TypeError: Cannot read property 'dom' of undefined

https://github.com/m4dc4p/draggable/blob/v07182011/draggable.js#L73

Destroying the dragged element before finishing the "avterValidDrop" method was causing problems since the drop event did not finish properly. I've managed to solve it by delaying the destroy action:

setTimeout(function() {droppedPanel.destroy(); }, 0);

PD: Thanks for that excellent example!