Applying patch provided by Steven te Brinke. XEP-0091 is replaced by XEP-0203, so Steven added support for XEP-0203 without removing support for XEP-0091 for backward compatibility. (OF-372)

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@11798 b35dd754-fafc-0310-a699-88a17e54d16e