ufgmg/subjunctive — pull request #35 by kalgynirae (2014-04-03 17:42:32+00:00)
Title: Timed events and image overlays

This does two things:

1. It adds the ability to have a function called after a certain delay. Think Green uses this to display the "Press [space] to play" message after a short delay.
2. It lets World subclasses specify an `overlays` list, which contains (offset, image) pairs of extra images that should be drawn on top of the screen.