Refresh skrollr on scroll and resize

[edoparearyee]

If an element's position is moved while scrolling or resizing the browser's window currently the element will still be animated using the keyframes calculated for the elements old position.

Example: using margin-top: -100px to move an element up the page will cause cause the data-bottom attribute styles to be initialised when the bottom of the element is 100px above the viewport instead of on the bottom of the viewport.