media-server: Add some debug
media-server: NULL-terminate the filter array

https://bugzilla.gnome.org/show_bug.cgi?id=728912
media-server: Don't take a reference in dlna_servers_manager_get_server

https://bugzilla.gnome.org/show_bug.cgi?id=728912
media-server: Added implementation for searchable servers

https://bugzilla.gnome.org/show_bug.cgi?id=728912