code: function _gpfPathExtension (path) {
      var name = _gpfPathName(path),
          pos = name.lastIndexOf(".");
      if (pos === _GPF_NOT_FOUND) {
          return "";
      }
      return name.substring(pos);
  }
docs: Get the extension of the last name of a path (including dot)
  
  @param {String} path Path to analyze
  @return {String} Extension (including dot)
  @since 0.1.9