Evaluation Function Update

Changed evaluation to reflect score from X's perspective each time.
Changed so that AI can play as both sides instead of simply as O. Also,
two-AI-per-game implementation has been dropped, so only X and o in a
game, no chance of P.
Alpha-Beta Search Update

Updated search function to work with new method, that is, AI can play
both as X and as O, not simply as O.
Player Construction Update

Changed the Player class definitions and comments to reflect the new
changes
->Only one AI per game
->AI can play both as X and as O
Main Function Update

Comments and additions to include player choices on turns and grid size,
along with already existing userName.
Game Construction Update

New constructor implementation of Game, to allow for choices of the
player.
->user name
->grid size
->X or O choice
Also changed game end messages to reflect these choices.
ReadMe Update

App Version 1.6 ReadMe update