code: function CrosswalkZip(path) {
  
      this._adm = new AdmZip(path);
  
      // Derive root entry name from the filename
      var base = Path.basename(path, ".zip");
      this._root = base + "/";
  
      // Extract version
      var version = base.split("-")[1];
      var numbers = version.split(".");
      this._version = new Version(+numbers[0], +numbers[1], +numbers[2], +numbers[3]);
  }
docs: Creates a CrosswalkZip object.
  @param {String} path Path to downloaded release
  @constructor