updating Board.scala so columFilled and rowFilled use the same function and pass in a Postion mapping function.

fixing tests.

fixing broken tests.

make tic-tac-toe a bit more functional, pass a game around and when adding a mark return a new game representation, include different Game types ActiveGame, WonGame, BoardFilledGame, save all the states of the game, add a replay for all game states that have been played, etc.

Initial commit for a simple scala tic-tac-toe game for hacker school, hope they think it's ok! =)