[#746] Split lightFalloff() and lightSpecular()
[#746] Split lightFalloff() and lightSpecular()

kevinb7/processing-js,guazipi/processing-js,baiyanghese/processing-js,jeresig/processing-js,guazipi/processing-js,corbanbrook/processing-js,kevinb7/processing-js,corbanbrook/processing-js,jaredly/processing-js,baiyanghese/processing-js,corbanbrook/processing-js,jeresig/processing-js,jaredly/processing-js