Lossy compression for lossless images

Changed

When requesting a lossless image from the VIP File System and specifying a quality value lower than 100, the image is now returned compressed in a lossy manner, instead of ignoring the quality request.

Added

The allow_lossy=1 query parameter has been added to opt-in to lossy compression for lossless images without having to specify a quality value. The VIP File System will tune compression based on the image and context.