* [Playground] Commit auto-changes to package.json, yarn.lock
* [Playground] Rerun create-react-native-app
Preserving rn-cli.js and transformer.js
Still not quite working.
* [Playground] Fix the Expo loading issue by removing projectRoots
Now it looks in the right place to find its resources, including 'entryPoint'.
* [Playground] Add postinstall script to clean up files Yarn copies in
Yarn copies them when installing locally, causing lots of @providesModule collisions.
* Update the Contributors guide to explain how to use the example app
And recommend Yarn by default
* [Playground] Remove now-obsolete rn-cli.config.js
* [Playground] Upgrade expo and other dependencies
* [Playground] Don't delete .git just in case
