* Allow webpack 2 as peerDependency

* Remove webpack as peer dependency

 - babel-preset-react-app@1.0.0
 - create-react-app@0.6.0
 - eslint-config-react-app@0.3.0
 - react-dev-utils@0.3.0
 - react-scripts@0.7.0

 - react-dev-utils@0.2.1
 - react-scripts@0.6.1

* Add syntax error overlay in development

* Support HMR being disabled

* Tweak CSS

Fixes https://github.com/facebookincubator/create-react-app/issues/625#issuecomment-249320724.

* Extract some utilities into a separate package

* Add utils dir to `files` in package.json

* Do not create an empty `utils` dir on eject