Implements sample gestures - sprite rotate and scale.
This code is updated implementation of multi-touch tutorial from youtube by user 'gtrgn':
https://www.youtube.com/watch?v=NkC1-Z_2brI
On Desktop machines touch emulation is turned on. It simulates touch events from mouse. It only emulates one touch point - seems like it can't emulate more.
To make scaling and rotating work you have to run it on mobile device with multi touch support.