* Change http-proxy-middleware logLevel from silent to error

* provide onError handler for httpProxyMiddleware

* Send proper error reponse upon proxy error.

* Change http-proxy-middleware logLevel from silent to error

* provide onError handler for httpProxyMiddleware

With the HTTPS env var set 'true', the dev server will serve over HTTPS.

* Disable contentBase in development

* Document #428

tagging dev-only code (@remove-on-publish-begin/end) and pre-eject-only code (@remove-on-eject-begin/end) #257 (#257)

Ref #387

Thanks to @geowarin for the tip in https://github.com/facebookincubator/create-react-app/issues/401#issuecomment-238291901

* Small grammatical correction

* Fix another grammatical error for consistency

This allows users to avoid CORS in simple projects that are hosted on the same server as backend.

Ref: https://twitter.com/sprjrx/status/760481328886272004

Fixes #322

The problem has since been fixed upstream.

This reverts commit f7011e04.

This fixes #302 by temporarily forking `detect-port`.
Hopefully this fix will be merged into the original project, and we can refer to it again.

This seems to work best, both on Windows, OS X, and Linux

Also fixes #194

Fixes #38

Local npm start and npm run build got broken by #33

* Make errors and warnings nicer

* Fix license stripping to not be eager

* Minor tweaks