When using the image_preloader the images can be loaded from an URL. #875
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This is a contribution for #866 to allow the usage of URLs as image source when using an image_preloader.
This implementation uses the Python3 versions of the IO and urllib modules.
Currently every image path is parsed by urlparse to see if it is a URL or local file path.
Another possibility would be to configure the image preloader at instantiation for a mode (e.g. use only internet images, use only local files or a mixed mode) to disable the parsing e.g. if only local files are used.