A loader for loading a [page:Material] in JSON format. This uses the [page:FileLoader] internally for loading files.
		// instantiate a loader
		var loader = new THREE.MaterialLoader();
		// load a resource
		loader.load(
			// resource URL
			'path/to/material.json',
			// onLoad callback
			function ( material ) {
				object.material = material;
			},
			// onProgress callback
			function ( xhr ) {
				console.log( (xhr.loaded / xhr.total * 100) + '% loaded' );
			},
			// onError callback
			function ( err ) {
				console.log( 'An error happened' );
			}
		);
		
		
		[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.
Object holding any textures used by the material. See [page:.setTextures].
See the base [page:Loader] class for common methods.
		[page:String url] — the path or URL to the file. This can also be a
			[link:https://developer.mozilla.org/en-US/docs/Web/HTTP/Basics_of_HTTP/Data_URIs Data URI].
		[page:Function onLoad] — Will be called when load completes. The argument will be the loaded [page:Material].
		[page:Function onProgress] — Will be called while load progresses. The argument will be the progress event.
		[page:Function onError] — Will be called when load errors.
		Begin loading from url.
		
		[page:Object json] — The json object containing the parameters of the Material.
		Parse a JSON structure and create a new [page:Material] of the type [page:String json.type] with parameters defined in the json object.
		
[page:Object textures] — object containing any textures used by the material.
[link:https://github.com/mrdoob/three.js/blob/master/src/[path].js src/[path].js]