Updated Amazon search/rhythmbox backend

[Lee Willis <lee leewillis co uk>]

I've updated the Amazon WSDL file, and .cs according to the latest I
could find on Amazon. I've also added exception handling, and fixed a
stupid case comparison bug in the rhythmbox backend, and added a brief
description of the artist, and album cluetypes

http://www.leewillis.co.uk/dashboard/albumart_final.patch

Note: This works without having to put a proper amazon dev tag in ;)

Lee
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Lee Willis                                lee leewillis co uk