pinch in and out on elements on handheld devices.
Install with component(1):
$ component install component/pinch
Pinch with the element
el and callback function
The event object
e is augmented with following keys:
x: the x coordinate of the midpoint between your two fingers
y: the y coordinate of the midpoint between your two fingers
scale: the relative distance between your two fingers starting at 1.
e.rotatesupport for android