Basic version of the tuto

It just follows the instructions from https://www.udemy.com/reactjs-pour-les-debutants

Demo: https://prstbt-chatbox-v1.surge.sh

What you'll learn?

• components, props, state
• routing
• events
• firebase sync
• css animations
• propTypes

The versions

• react: 15.3.2
• react-addons-css-transition-group: 15.4.1
• react-dom: 15.3.2
• react-router: 4.0.0-alpha.3
• re-base: 2.3.0