Lint internal scripts with eslint:recommended (facebook#1729)

* Lint internal scripts with eslint:recommended

* Warnings r bad

packages/react-scripts/config/webpack.config.prod.js

@@ -22,6 +22,19 @@ const eslintFormatter = require('react-dev-utils/eslintFormatter');
 const ModuleScopePlugin = require('react-dev-utils/ModuleScopePlugin');
 const paths = require('./paths');
 const getClientEnvironment = require('./env');
+var autoprefixer = require('autoprefixer');
+var webpack = require('webpack');
+var HtmlWebpackPlugin = require('html-webpack-plugin');
+var ExtractTextPlugin = require('extract-text-webpack-plugin');
+var ManifestPlugin = require('webpack-manifest-plugin');
+var InterpolateHtmlPlugin = require('react-dev-utils/InterpolateHtmlPlugin');
+var paths = require('./paths');
+var getClientEnvironment = require('./env');
+
+// @remove-on-eject-begin
+// `path` is not used after eject - see https://github.com/facebookincubator/create-react-app/issues/1174
+var path = require('path');
+// @remove-on-eject-end
 
 // Webpack uses `publicPath` to determine where the app is being served from.
 // It requires a trailing slash, or the file assets will get an incorrect path.