docs: function postImage(options, filename, headers, cb) {
      Step(
          function readImage() {
              fs.readFile(filename, this);
          },
          function(err, filecontents) {
              if (err) {
                  console.log('Unable to read file', __dirname);
                  return;
              }
              postData(null, [{
                  type: 'image/jpeg',
                  keyname: 'image',
                  valuename: 'image.jpg',
                  data: filecontents
              }], options, headers, this);
          },
          function(err, response, body) {
              cb && cb(err, response);
              console.log("response code " + response.statusCode, ", body is : ", body);
          }
      );
  }