code: function getWindowsVersion () {
      return spawn('ver').then(function (output) {
          var match = /\[Version (.*)\]\s*$/.exec(output);
          return Version.fromString(match[1]);
      }).fail(function () {
          return Version.fromString(os.release());
      });
  }
docs: Return Version object for current Windows version. User 'ver' binary or
  os.release() in case of errors.
  
  @return  {Version}  Version information for current OS.