Put transcoding target mime to http uri rather than a boolean.
Put transcoding target mime to http uri rather than a boolean.

svn path=/trunk/; revision=655

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