Loader#images()

Adds an array of images to the current load queue.

It works by passing each element of the array to the Loader.image method.

The files are not loaded immediately after calling this method. The files are added to the queue ready to be loaded when the loader starts.

Phaser can load all common image types: png, jpg, gif and any other format the browser can natively handle.

The keys must be unique Strings. They are used to add the files to the Phaser.Cache upon successful load.

Retrieve the images via Cache.getImage(key)

The URL can be relative or absolute. If the URL is relative the Loader.baseURL and Loader.path values will be prepended to it.

If the URL isn't specified the Loader will take the key and create a filename from that. For example if the key is "alien"
and no URL is given then the Loader will set the URL to be "alien.png". It will always add .png as the extension.
If you do not desire this action then provide a URL.