Adding a program to experiment with distributions.

The hope is that this will allow me to estimate a target density.
The current iteration uses some prior densities and uses an update
process to change the relative representation of the priors. Once
this basic version works, I plan to experiment with more grand things.
Added the timeout and tic_tac_toe code.

tic_tac_toe.py is not finished; it doesn't work, and it doesn't
even test the idea I originally wanted to explore.