With this function you can create multiple milestones in a single
        request. See the "create" function for a description of the individual
        fields in the milestone.

def create_milestones(self, project_id, milestones):
        """
        With this function you can create multiple milestones in a single
        request. See the "create" function for a description of the individual
        fields in the milestone.
        """
        path = '/projects/%u/milestones/create' % project_id
        req = ET.Element('request')
        for milestone in milestones:
            req.append(self._create_milestone_elem(*milestone))
        return self._request(path, req)