Redesign of Connect Four

A revamped front-end for Connect Four by John Moss.

#### Main Changes
- Fully responsive using custom grid system (@media-query)
- Redesigned interface
- Several components color coded by current turn (red/yellow)
- Rem font sizing (for added responsiveness and other benefits)
- Redesigned notifications
- Subtle interface animations using Animate.css
- Smooth scrolling to game board when 'Start Game' is selected
- Connect Four 'cells' remain square regardless of window size (except under old Android devices, odd quirk)