code: function(fileName, content) {
                  return Promise()
                  .then(function() {
                      var filePath = PathUtils.resolveInRoot(outputFolder, fileName);
  
                      return fs.ensureFile(filePath)
                      .then(function() {
                          return fs.writeFile(filePath, content);
                      });
                  });
              }
docs: Write a file to the output folder,
  It creates the required folder
  
  @param {String} fileName
  @param {Buffer} content
  @return {Promise}