message: Updated PIXI.loaders.Loader docs
  To match actual version
diff: @@ -10,17 +10,44 @@ import bitmapFontParser from './bitmapFontParser';
  * The new loader, extends Resource Loader by Chad Engler: https://github.com/englercj/resource-loader
  *
  * ```js
  - * let loader = PIXI.loader; // pixi exposes a premade instance for you to use.
  + * const loader = PIXI.loader; // pixi exposes a premade instance for you to use.
  * //or
  - * let loader = new PIXI.loaders.Loader(); // you can also create your own if you want
  + * const loader = new PIXI.loaders.Loader(); // you can also create your own if you want
  *
  - * loader.add('bunny', 'data/bunny.png');
  - * loader.add('spaceship', 'assets/spritesheet.json');
  + * const sprites = {};
  + *
  + * // Chainable `add` to enqueue a resource
  + * loader.add('bunny', 'data/bunny.png')
  + * .add('spaceship', 'assets/spritesheet.json');
  * loader.add('scoreFont', 'assets/score.fnt');
  *
  - * loader.once('complete',onAssetsLoaded);
  + * // Chainable `pre` to add a middleware that runs for each resource, *before* loading that resource.
  + * // This is useful to implement custom caching modules (using filesystem, indexeddb, memory, etc).
  + * loader.pre(cachingMiddleware);
  + *
  + * // Chainable `use` to add a middleware that runs for each resource, *after* loading that resource.
  + * // This is useful to implement custom parsing modules (like spritesheet parsers, spine parser, etc).
  + * loader.use(parsingMiddleware);
  + *
  + * // The `load` method loads the queue of resources, and calls the passed in callback called once all
  + * // resources have loaded.
  + * loader.load((loader, resources) => {
  + * // resources is an object where the key is the name of the resource loaded and the value is the resource object.
  + * // They have a couple default properties:
  + * // - `url`: The URL that the resource was loaded from
  + * // - `error`: The error that happened when trying to load (if any)
  + * // - `data`: The raw data that was loaded
  + * // also may contain other properties based on the middleware that runs.
  + * sprites.bunny = new PIXI.TilingSprite(resources.bunny.texture);
  + * sprites.spaceship = new PIXI.TilingSprite(resources.spaceship.texture);
  + * sprites.scoreFont = new PIXI.TilingSprite(resources.scoreFont.texture);
  + * });
  *
  - * loader.load();
  + * // throughout the process multiple signals can be dispatched.
  + * loader.onProgress.add(() => {}); // called once per loaded/errored file
  + * loader.onError.add(() => {}); // called once per errored file
  + * loader.onLoad.add(() => {}); // called once per loaded file
  + * loader.onComplete.add(() => {}); // called once when the queued resources all load.
  * ```
  *
  * @see https://github.com/englercj/resource-loader
  