GZIP of request, responses

[pdiazvargas]

What

Handle the case in which the request is gzipped. Make sure we can gzip and gunzip the payload of a given request when the request sends data zipped. This feature should be implemented after the changes to support multiple content-types.

How

While processing a request, unzip the payload on demand, and gzip the response back.

Why

For optimization purposes, being able to support gzipped communication is important.