version with very rough fix for dragging on mobile
also included hammer.js which can be used to detect mobile swipe and pinch gestures (without jquery)
hammer.js files :-)
working drag functionality - working on pinch
version with working panning
still needs to be polished...
global hammer instance (so that we can use this library for all multi-touch events)
improved panning logic with max and min zoom levels now correctly implemented (even though it could be more efficient)