code: function(filePath, callback) {
      var text = fs.readFileSync(path.resolve(filePath), 'utf8');
      return this.executeOnText(text, filePath, callback);
    }
docs: Executes the current configuration on an array of file and directory names.
  @param {string} filePath the file to lint
  @param {Function} callback the callback.
  @returns {Object} The results for all files that were linted.