Banner doesn't work in Safari 6

[DavidBruant]

Works for Safari 7.
Most likely because of requestAnimationFrame.
Include the polyfill https://gist.github.com/paulirish/1579671

Props to @oncletom.

[thom4parisot]

Proposed as a PR in anthill/AntColony#12

[DavidBruant]

Hadn't noticed. Answering there.

[thom4parisot]

Have read your email meanwhile ;-p