added members to a chatroom. (xmpp.muc.skipInvite).  Default behaviour
follows the spec and invites (xmpp.muc.skipInvite is false).


git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@11682 b35dd754-fafc-0310-a699-88a17e54d16e