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Collidable Draggables
Adds collision detection to draggable objects.
Add "collide: 'block'" or "collide: 'flag'" when you create a draggable:
$(".box").draggable({collide: 'flag'});
or
$(".box").draggable({collide: 'block'});
In 'flag' mode overlapping objects receive new classes - 'ui-draggable-overlapping' for the object being dragged and 'ui-draggable-overlapped' for the other object. In 'block' mode objects are blocked from overlapping other objects by being snapped to the edge of the object they collided with.
This doesn't currently play well with constraints because they are applied before the drag event is propagated.
