Compressing messages in WCF part two - Expanding the GZipMessageEncoder and fixing another bug

The GZipMessageEncoder is a great sample for learning about MessageEncoders in general. In this post, I will expand the GZipMessageEncoder to do both GZip and Deflate compression. This will accomplish two things: (1) explain various pieces of a MessageEncoder and (2) set a groundwork for future posts. Since the MessageEncoder will now support both GZip and Deflate, it would be a good idea to