Update jquery.easy-pie-chart.coffee
Update jquery.easy-pie-chart.coffee

jQueryUI like easing method
- It is easier to change it to Cube/Quart/Quint
- In the future, easing could be set in options, to use jQueryUI effect easing methods
LulzAugusto/easy-pie-chart,zhimin711/easy-pie-chart,imskojs/easy-pie-chart,shahadatnb/easy-pie-chart,makarenok/easy-pie-chart,rendro/easy-pie-chart,rendro/easy-pie-chart,makarenok/easy-pie-chart,grigorkh/easy-pie-chart,grigorkh/easy-pie-chart,shahadatnb/easy-pie-chart,imskojs/easy-pie-chart,zhimin711/easy-pie-chart,LulzAugusto/easy-pie-chart,fang51/easy-pie-chart