Support ReplayTV media (actually via WiRNS or DVArchive) by reading the included XML.

I have lots of media from ReplayTVs on my various hard drives. These have been downloaded by WiRNS or DVArchive, so they are accompanied by XML files full of metadata (episode title, air date, cast, etc.) It would be great if Boxee could use this data to properly display these shows grouped by tv show, season, etc. If you want samples, I can give you some.