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Adds HOST and PORT env variables to react app so websocket

Closed Administrator requested to merge github/fork/scisci/master into master

Created by: scisci

Adds HOST and PORT env variables to react app so websocket can use them instead of window.location.

This addresses the issue listed here: https://github.com/facebookincubator/create-react-app/issues/853

This can be tested by adding a .env file to an app with the following content:

HOST=127.0.0.1
PORT=3000

Then run the app by visiting http://localhost:3000. If you look at the network requests, you will see the websocket is using 127.0.0.1 and not localhost.