Bug fix invitation service was approving too many invitations!
Implemented security rules for who is allowed to cancel a moderated invitation.
Continuing implementation of group authority scripts.
git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@13815 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261
