Add more discrete Toy-Problem tests.

[JoeyAndres]

In addition to random-walk for discrete rl tests, add:

1. Vacuum World
2. 8-puzzle or general Sliding-block puzzles.
3. 8-queens problem or general N-queens problem.
4. Random Walk.

[JoeyAndres]

Make this a repository of its own. See boost ipc and node-ipc. Good way to start looking around.