Provide a module for serving agregated CSS and JSS from local public filesystem instead of S3 when option "use_s3_for_public" is used

I had problems with my CSS and JS aggregated files being stored and served from S3, because it was more difficult to serve them compressed. I know that it could be possible to play with S3 metadata, but this is my quick and easy approach:

I've created a module that replaces asset.css.dumper and asset.js.dumper services, making them to use a new custom Dumper class using a custom stream which is indeed the real core PublicStream.

It could be interesting adding it as a s3fs submodule, or make its funcionality part of some already existing.

Hope it helps!