MediaContainer is now an abstract class.
MediaContainer is now an abstract class.

svn path=/trunk/; revision=524

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