#14: Bug with wrong filename due to change.
#13: Added window closing event.
#13: Reversed order of subsystem destruction.
#13: Shader sets are now managed OpenGL objects.
#13: Allow window to clean up GL systems.
Formatting fix.
Pong tests new window event. Issue #13 closed.
Merge remote-tracking branch 'origin/master' into praecursor
Updated menu to use new API + proper colors.