A loader for loading a .obj resource.
		The OBJ file format is a simple data-format
		that represents 3D geometry in a human readable format as the position of each vertex, the UV position of
		each texture coordinate vertex, vertex normals, and the faces that make each polygon defined as a list of
		vertices, and texture vertices.
		
		// instantiate a loader
		var loader = new THREE.OBJLoader();
		// load a resource
		loader.load(
			// resource URL
			'models/monster.obj',
			// called when resource is loaded
			function ( object ) {
				scene.add( object );
			},
			// called when loading is in progresses
			function ( xhr ) {
				console.log( ( xhr.loaded / xhr.total * 100 ) + '% loaded' );
			},
			// called when loading has errors
			function ( error ) {
				console.log( 'An error happened' );
			}
		);
		
		[example:webgl_loader_obj]
		[page:LoadingManager manager] — The [page:LoadingManager loadingManager] for the loader to use. Default is [page:LoadingManager THREE.DefaultLoadingManager].
Creates a new [name].
See the base [page:Loader] class for common properties.
See the base [page:Loader] class for common methods.
		[page:String url] — A string containing the path/URL of the .obj file.
		[page:Function onLoad] — (optional) A function to be called after the loading is successfully completed. The function receives the loaded [page:Object3D] as an argument.
		[page:Function onProgress] — (optional) A function to be called while the loading is in progress. The function receives a XMLHttpRequest instance, which contains [page:Integer total] and [page:Integer loaded] bytes.
		[page:Function onError] — (optional) A function to be called if an error occurs during loading. The function receives error as an argument.
		
Begin loading from url and call onLoad with the parsed response content.
[page:String text] — The textual obj structure to parse.
		Returns an [page:Object3D]. It contains the parsed meshes as [page:Mesh] and lines as [page:LineSegments].
		All geometry is created as [page:BufferGeometry]. Default materials are created as [page:MeshPhongMaterial].
		If an obj object or group uses multiple materials while declaring faces, geometry groups and an array of materials are used.
		
[page:MTLLoaderMaterialCreator MTLLoader.MaterialCreator materials] - A MaterialCreator instance.
Sets materials loaded by MTLLoader or any other supplier of a [page:MTLLoaderMaterialCreator MTLLoader.MaterialCreator].
[link:https://github.com/mrdoob/three.js/blob/master/examples/js/loaders/OBJLoader.js examples/js/loaders/OBJLoader.js]