Made sip_publish_presence's return code based on publication_status

darcs-hash:20090115134527-1e3d8-5869134a7cf40004b4a57f2099678b6934e1496c
Made sip_publish_presence exit cleanly

darcs-hash:20090115134558-1e3d8-dcf3e78628d45f09c58f99f782762058288f3a25