WP7Contrib: Added support for GZip compression to ResourceClient

With the release of Mango for WP7 and a user request for GZip compression support in the contrib I've added GZip compression support to the ResourceClient in WP7Contrib.This means you can now request GZip compression for HTTP requests against back end web servers when using the ResourceClient in the contrib. All you have to do is specify 'WithGZip' method in the setup:

When you compare the debug statements in the output window of visual studio you can see the difference in HTTP response lengths, the first shows no compression and the second includes compression:

As you can see the HTTP response length drops from 43273 (bytes) to 8927 (bytes), this is obviously great not only from a performance point of view of the app but also from the cost to user, we have managed to lower their data usage.

This code is available in the GZipDemo app in the WP7Contrib Spikes directory (7.1).

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