Fix for displayName transform

Summary: The `react.displayName` transform was added in 93b9329. That diff missed to update the `.babelrc` where the comment says it should stay in sync (I'm not sure where it's used though). I added a comment in the other direction so this can be prevented in the future. I also updated the `cacheVersion` so we actually transform the code again to add the missing displayName properties to unchanged components. Closes facebook#2905 Reviewed By: @vjeux Differential Revision: D2473447 Pulled By: @kassens

Author: kassens

packager/packager.js

@@ -291,7 +291,7 @@ function getAppMiddleware(options) {
  nonPersistent: options.nonPersistent,
  projectRoots: options.projectRoots,
  blacklistRE: blacklist(),
- cacheVersion: '2',
+ cacheVersion: '3',
  transformModulePath: transformerPath,
  assetRoots: options.assetRoots,
  assetExts: ['png', 'jpeg', 'jpg'],

packager/react-packager/.babelrc

@@ -20,6 +20,7 @@
  "es7.objectRestSpread",
  "flow",
  "react",
+ "react.displayName",
  "regenerator"
  ],
  "sourceMaps": false

packager/transformer.js

@@ -31,6 +31,7 @@ function transform(src, filename, options) {
  comments: false,
  filename,
  whitelist: [
+ // Keep in sync with packager/react-packager/.babelrc
  'es6.arrowFunctions',
  'es6.blockScoping',
  'es6.classes',