code: function createOutputFolder(next) {
      var defPath         = path.join(getConfig('output.folder'), 'definition-files'),
          defPathCustom   = path.join(getConfig('output.folder'), 'definition-files-custom');
  
      fs.remove(defPath, function (err) {
          if (err) { next(err); }
          fs.createFile(path.join(defPath, '_Dont_add_or_edit_any_files'), function (err) {
              if (err) { next(err); }
              fs.mkdirs(defPathCustom, function (err) {
                  if (err) { next(err); }
                  next(null);
              });
          });
      });
  }
docs: Creates 'definition-files' and 'definition-files-custom' directories if they do not exist.
  Before creating definition-files it deletes definition-files directory.
  @private
  @param {function} next - Callback to execute