Based on React Rocket, a ReactJS/ES6/Gulp Boilerplate by Jake Marsh. Very Nice.

1. Run npm install from the root directory
2. Run gulp dev (may require installing Gulp globally npm install gulp -g)
3. Your browser will automatically be opened and directed to the browser-sync proxy address
4. To prepare assets for production, run the gulp prod task (Note: the production task does not fire up the browser-sync server, and won't provide you with browser-sync's live reloading. Simply use gulp dev during development. More information below)

Now that gulp dev is running, the server is up as well and serving files from the /build directory. Any changes in the /app directory will be automatically processed by Gulp and the changes will be injected to any open browsers pointed at the proxy address.