Add image compression functionality to djnagoldp-uploader component
The goal is to add an image compression option when uploading,
this feature would be used especially when uploading a profile picture or a community logo.
The developer who wants to use it will simply have to specify the right parameters when using the djangoldp-uploader.
Please note that it is very important that the addition of this option does not impact the existing,
all existing developments already using the djangoldp-uploader should continue to work as they do today without developers having to make changes to their past developments unless they want to implement this new compression option.