function GLTFLoader( manager ) {

		this.manager = ( manager !== undefined ) ? manager : THREE.DefaultLoadingManager;

	}
@author Rich Tibbett / https://github.com/richtr
@author mrdoob / http://mrdoob.com/
@author Tony Parisi / http://www.tonyparisi.com/
@author Takahiro / https://github.com/takahirox