Provide "audio/mpeg" transcode uri for music items.
Provide "audio/mpeg" transcode uri for music items.

svn path=/trunk/; revision=692

GNOME/rygel,Tarnyko/rygel,luisbg/rygel,Pelagicore/Media-Manager-Rygel-patched,GNOME/rygel,jku/rygel,Pelagicore/Media-Manager-Rygel-patched,Tarnyko/rygel,jku/rygel,GNOME/rygel,Pelagicore/Media-Manager-Rygel-patched