Added requestAnimationFrame
Added requestAnimationFrame

To fix the warning " 'webkitRequestAnimationFrame' is vendor-specific. Please use the standard 'requestAnimationFrame' instead. " in more recent versions of Chrome
beni55/dat.gui,korczis/dat.gui-ng,imgntn/dat.gui,sojs/dat.gui,imgntn/dat.gui,korczis/dat.gui-ng,drhayes/dat.gui,sojs/dat.gui,GerHobbelt/dat.gui,nmss/dat.gui,drhayes/dat.gui,terryma/dat.gui,dataarts/dat.gui,GerHobbelt/dat.gui,nmss/dat.gui,camellhf/dat.gui,terryma/dat.gui,beni55/dat.gui,dataarts/dat.gui,camellhf/dat.gui