TinderBox - Started new app

Gray box in center. Drag and let go will snap to center. Logging left
and right thresholds when let go.
TinderBox - Added left and right thresholds

If center of box is dragged past left edge of screen, box will animate
off the screen and a reset button will appear. Same goes for the right
side of screen. Else, will snap back to center of screen.