Make timeout argument on Invitation.disconnect() work in all situations

darcs-hash:20090508102357-58103-08d93fee040c877a49acd6e4ffabf3cbbd650895
Added timeout argument to Invitation.send_invite()

darcs-hash:20090508113823-58103-2b3ae688c18b7b322bf87b99f2af612cef7ad07a