message: build(aio): ensure downloadable zip filenames are unique
  Fixes
  PR Close
diff: @@ -62,7 +62,7 @@ class ExampleZipper {
  let exampleZipName;
  const exampleType = this._getExampleType(path.join(sourceDirName, relativeDirName));
  if (relativeDirName.indexOf('/') !== -1) { // Special example
  - exampleZipName = relativeDirName.split('/')[0];
  + exampleZipName = relativeDirName.split('/').join('-');
  } else {
  exampleZipName = jsonFileName.replace(/(plnkr|zipper).json/, relativeDirName);
  }
  