Added closed loop option to CatmullRom
Added closed loop option to CatmullRom

sebavan/Babylon.js,jbousquie/Babylon.js,NicolasBuecher/Babylon.js,BabylonJS/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,jbousquie/Babylon.js,Kesshi/Babylon.js,sebavan/Babylon.js,sebavan/Babylon.js,NicolasBuecher/Babylon.js,jbousquie/Babylon.js,RaananW/Babylon.js,NicolasBuecher/Babylon.js,Kesshi/Babylon.js,BabylonJS/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js