docs: def status(self, start, end, sources=None):
          """ Check the data coverage in the Historics archive for a given interval.
  
              Uses API documented at http://dev.datasift.com/docs/api/rest-api/endpoints/historicsstatus
  
              :param start: Unix timestamp for the start time
              :type start: int
              :param end: Unix timestamp for the start time
              :type end: int
              :param sources: list of data sources to include.
              :type sources: list
              :return: dict of REST API output with headers attached
              :rtype: :class:`~datasift.request.DictResponse`
              :raises: :class:`~datasift.exceptions.DataSiftApiException`, :class:`requests.exceptions.HTTPError`
          """
          params = {'start': start, 'end': end}
          if sources:
              params['sources'] = ','.join(sources)
          return self.request.get('status', params=params)