minor cosmetic changes
added test to read folder, removing the need to update a plays.csv file whenever we add a new play
passing test, to create a play just put the play config file in one of the plays folders, its strategies will go in a folder of the same name (still a todo)
adding a file back in until i get the entire file reading system in
fully realized file reading system
Probability fixes: 1) Game now resets the overall probability in between runs.  Previously, it was considering the probability that the play AND THE PLAY BEFORE IT worked.  This is via the resetProbability() functions in Game and Play.  2) Variability no longer produces negative or >1 results.  This is fixed by dampening the variability and changing the variability function in the player class so that it won't allow the probability of any one event to be <0 or >1 (because... rules of probability).