code: def send_message(self, message, mention_id=None, mentions=[]):
          
          messages = self.tokenize(message, self.MESSAGE_LENGTH, mentions)
          code = 0
          for message in messages:
              if self.dry_run:
                  mention_message = ''
                  if mention_id:
                      mention_message = " to mention_id '{0}'".format(mention_id)
                  logging.info("Not posting to Twitter because DRY_RUN is set. Would have posted "
                               "the following message{0}:\n{1}".format(mention_message, message))
              else:
                  try:
                      self.twitter.statuses.update(status=message,
                                                   in_reply_to_status_id=mention_id)
                  except TwitterHTTPError as e:
                      logging.error('Unable to post to twitter: {0}'.format(e))
                      code = e.response_data['errors'][0]['code']
          return code
docs: Send the specified message to twitter, with appropriate mentions, tokenized as necessary
          :param message: Message to be sent
          :param mention_id: In-reply-to mention_id (to link messages to a previous message)
          :param mentions: List of usernames to mention in reply
          :return: