Issue title: No mobile support
 Issue body: This is a great however it does not respond to touch events and therefore does not work on mobile devices such as the iPad.  Real important feature nowadays.

 Comments: 
 Comment 0: I'm not quite sure how to implement this on touch devices, especially since I have nothing good to test with. Is it enough to bind to `ondblclick`?

 Comment 1: Here are some pointers:

on('mousedown') becomes: on('mousedown touchstart'

Then you'll have an issue with e.pageX which needs to be e.originalEvent.touches[0].pageX if mobile device

Really speaking there is not much you have to change in your code to make it mobile compatible.  Try and have a look if I get chance, but pressing deadlines are keeping me up at the moment.

 Comment 2: Touch events are now supported in the latest versions :)
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