code: function logResults(output) {
    var context = requisition.conversionContext;
    return output.convert('string', context).then(function(message) {
      if (output.error) {
        console.error(message);
      }
      else {
        console.log(message);
      }
      return output;
    });
  }
docs: Convert an Output object to a string, and then log that to stdout/stderr
  depending on the error status