Improve eslint rules (#3147)

* Add semi to ESLint rules

* Add padded-blocks to ESLint rules

* Add comma-dangle to ESLint rules

* add config/webpack and storyboard

* add streaming/

* yarn test:lint -- --fix

config/webpack/loaders/coffee.js

@@ -1,4 +1,4 @@
 module.exports = {
   test: /\.coffee(\.erb)?$/,
-  loader: 'coffee-loader'
-}
+  loader: 'coffee-loader',
+};