Flipped flip

This PR addresses daneden/animate.css#214.

Basically, I flipped the rotation so that it is pivoting from -360deg to 0 rather than 0 to 360deg. Visually it looks the same, but it behaves a little better in Chrome.

[Here's](http://jsfiddle.net/Vk2ke/4/) an updated fiddle that uses this new flip.