(1) Setup:
npm install
(2) Run server:
node server.js
(3) View demo (direct, no web workers): http://localhost:3000/
https://boiling-meadow-36770.herokuapp.com
(4) View demo (indirect, use web workers): http://localhost:3000?useWebWorker=true
https://boiling-meadow-36770.herokuapp.com/?useWebWorker=true