Convert 'url' to unicode

Fix the error: SEARCHQUEUE-RSS-SEARCH :: Error while searching "PROVIDER", skipping: You must not use 8-bit bytestrings unless you use a text_factory that can interpret 8-bit bytestrings

More info:
http://sickbeard.com/forums/viewtopic.php?f=9&t=2386&start=1600#p39190