v3.0 - Image rotation support

This 3.x version adds support for image rotation.

Because of that I needed to change the way the zoom image got positioned, from absolute positioning to 2D transforms. This, and the rotation transform has made the plugin not compatible with Internet Explorer versions before IE10, and I've bumped the version to 3.0 from 2.0.

You can disable the image rotation feature in blogs or other similar contexts by passing a false to the pan() method.