core: Support for search by album and artist
core: Support for search by album and artist

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