Worked on materials about nondeterminism.

  - made a couple of animations, for normal and nondeterministic function composition
  - started on some standard (.org) slides as well
Removed random foo.hs file.
Changed my visualizations to use the keyboard rather than the mouse.
Cleaned up my .org slides for public dissemination.

  - added the map coloring example
  - added links to my visualizations
Added .aux and .log files to my .gitignore.