Day/Night Cycle Added to ISS Demo

Download the Win64/DK2 version with these changes (Leap Motion/Bluetooth Controller/Nod Ring supported but optional)

Some nice updates today to this demo: - Built out a day/night shader transition system (hooked to mousewheel temporarily) - Tweaked the PC controls to make them more friendly (WASD/Arrows + Mouse) - Added time controls to speed up or slow down your tour of the world (+/-) - Enter/Esc to reset demo/reorient headset