'Add a new roster node for the given JID.
Arguments:
node -- The JID for the new roster node.'

def add(self, node):

    if (not isinstance(node, JID)):
        node = JID(node)
    node = node.bare
    if (node not in self._rosters):
        self._rosters[node] = RosterNode(self.xmpp, node, self.db)
