Updated build command
Updated build command

Updated Gulp folder readme to reflect new build command that resolves the memory pressure issue.
jbousquie/Babylon.js,jbousquie/Babylon.js,RaananW/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,sebavan/Babylon.js,BabylonJS/Babylon.js,Kesshi/Babylon.js,RaananW/Babylon.js,Kesshi/Babylon.js,BabylonJS/Babylon.js,jbousquie/Babylon.js,Kesshi/Babylon.js,NicolasBuecher/Babylon.js,NicolasBuecher/Babylon.js,sebavan/Babylon.js,NicolasBuecher/Babylon.js,RaananW/Babylon.js