Add new tolerance options for small droppables

The current tolerance options for droppables seem to assume the droppable is smaller than the draggable, and aren't very useful if the draggable is larger. I propose two additional tolerance options: 'enclose', which triggers if the droppable is fully inside the draggable, and 'overlap', which triggers if the draggable overlaps the center of the droppable. I have found 'overlap' in particular to be very useful for my application.

Sample implementations are provided below. They are simple enough that I do not claim any copyright over them. They can be inserted into the case statement in $.ui.intersect that begins "switch (toleranceMode) {":

		case 'enclose':		//test if draggable completely encloses droppable
			return (x1 <= l && x2 >= r &&
				y1 <= t && y2 >= b);
			break;
		case 'overlap':		//test if draggable overlaps center of droppable
			return (x2 > l + (droppable.proportions.width / 2)	
				&& x1 < l + (droppable.proportions.width / 2)	
				&& y1 < t + (droppable.proportions.height / 2)	
				&& y2 > t + (droppable.proportions.height / 2));	
			break;

I would like to see these or similar options added to future UI releases.