CAS Single Sign Out support

Last versions on JA-SIG CAS servers support Single Sign Out protocol. When a user logs out from CAS server, a callback request is sent to every service he has been logged in so that all the sessions are invalidated.
Yale CAS client does not support Single Sign Out but JA-SIG CAS client does. It may be a good idea to migrate to JA-SIG CAS client to support this feature.

Links :
http://www.ja-sig.org/wiki/display/CASUM/Single+Sign+Out
http://www.ja-sig.org/wiki/display/CASC/Configuring+Single+Sign+Out