def discover_items(node=nil)
      iq = connection.iq_stanza({'to'=>jid.to_s}, x('query', 'xmlns' => Namespaces::DiscoverItems))
      send_iq_stanza_fibered iq
    end
def discover_items(node=nil)
      iq = connection.iq_stanza({'to'=>jid.to_s}, x('query', 'xmlns' => Namespaces::DiscoverItems))
      send_iq_stanza_fibered iq
    end
discovers items (disco#items) of an entity
 can optionally specify a node to discover