def addUser(self, invitationList,
                subject, html):
        """
        adds a user without sending an invitation email

        Inputs:
           invitationList - InvitationList class used to add users without
            sending an email
           subject - email subject
           html - email message sent to users in invitation list object
        """
        url = self._url + "/invite"
        params = {"f" : "json"}
        if isinstance(invitationList, parameters.InvitationList):
            params['invitationList'] = invitationList.value()
        params['html'] = html
        params['subject'] = subject
        return self._post(url=url,
                             param_dict=params,
                             securityHandler=self._securityHandler,
                             proxy_url=self._proxy_url,
                             proxy_port=self._proxy_port)
adds a user without sending an invitation email

        Inputs:
           invitationList - InvitationList class used to add users without
            sending an email
           subject - email subject
           html - email message sent to users in invitation list object