Support touch events plus more

Added support for pinch and drag touch gestures for mobile device support (adds requirement for toe.js).
Added dependency on the requestAnimationFrame polyfill provided by Zoetrope for more responsive image scaling anddragging.
Changed to using css transform to scale and translate image for better performance on mobile platforms.
Minimum IE supported is now IE 9 - stick with version 0.6 if you need IE 8 support.
Updated Grunfile.js to include tests against latest version (2.1.0) of jQuery.