Add method to detect if stream has been accepted.
Add method to detect if stream has been accepted.

svn path=/trunk/; revision=346

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