* Replace `scriptPreprocessor` config with `transform`.
* Also remove `moduleFileExtensions` which has been redundant since 16.0
(`['js', 'json', 'jsx', 'node’]` is the default)
Upgrade `babel-loader` and remove the cache directory configuration
that was added in #620. `babel-loader` now uses the
`./node_modules/.cache/babel-loader` directory by default, so the
custom config is no longer needed.
* Update dependencies
* Use published version of eslint-config-react-app for development
We dogfood on our eslint-config-react-app by using it as our ESLint config,
but installing it from the local folder causes problems when its peerDependencies
are updated, because npm won't update it unless the version number changes.
Use the published version for dogfooding so it can be installed from npm.
* Create asset filenames mapping on the build output
I use danethurber/webpack-manifest-plugin on Webpack production
configuration to create a file named `asset-manifest.json` which contain a
mapping of all asset filenames to their corresponding output file.
`asset-manifest.json` will be located at the root of output folder.
This'll resolve#600
* Add an explanation for ManifestPlugin
* Make webpack-manifest-plugin's version exact
* Move ESLint configuration to a separate package
* Remove the ESLint configuration, moved to eslint-config-react-app
* Update ESLint instructions
* Pin the package versions in eslint-config-react-app
* Add a README for eslint-config-react-app
* Update README.md
* Update README.md
* Update README.md
* Update README.md
* Update package.json
* Update package.json
* Update production eslint-loader config
* Add the ESLint config to devDependencies of the repo
