Zynga scroller doesn't need the Raf.js polyfill.

[popham]

The index.html page includes the Raf.js polyfill. This commit removed the Raf.js polyfill from ZyngaScroller. This issue hints that including the polyfill as a global caused some grief (in FF3.6 and IE8). The polyfill code was incorporated into Animate.js, making the inclusion of Raf.js redundant.

Over here I've wrapped the Scroller.js and Animate.js with UMD and published to npm under scroller. Would you be receptive to a pull request? That is,

• Swap ZyngaScroller for the packaged one.
• Remove the Zynga Scroller script tags from index.html.