Created by: Timer
Note we now open to localhost but display 0.0.0.0 for explicitness. It may no longer be necessary to show 0.0.0.0 since we're displaying a network address.
Also addresses #2149 (closed), but with caveats -- see https://github.com/facebookincubator/create-react-app/issues/2149#issuecomment-301366657.