docs: def create(self, stream, start, parameters, sources, end=None):
          """ Create a hitorics preview job.
  
              Uses API documented at http://dev.datasift.com/docs/api/rest-api/endpoints/previewcreate
  
              :param stream: hash of the CSDL filter to create the job for
              :type stream: str
              :param start: Unix timestamp for the start of the period
              :type start: int
              :param parameters: list of historics preview parameters, can be found at http://dev.datasift.com/docs/api/rest-api/endpoints/previewcreate
              :type parameters: list
              :param sources: list of sources to include, eg. ['tumblr','facebook']
              :type sources: list
              :param end: (optional) Unix timestamp for the end of the period, defaults to min(start+24h, now-1h)
              :type end: int
              :return: dict of REST API output with headers attached
              :rtype: :class:`~datasift.request.DictResponse`
              :raises: :class:`~datasift.exceptions.HistoricSourcesRequired`, :class:`~datasift.exceptions.DataSiftApiException`, :class:`requests.exceptions.HTTPError`
          """
          if len(sources) == 0:
              raise HistoricSourcesRequired()
          if isinstance(sources, six.string_types):
              sources = [sources]
          params = {'hash': stream, 'start': start, 'sources': ','.join(sources), 'parameters': ','.join(parameters)}
          if end:
              params['end'] = end
          return self.request.post('create', params)