Merge pull request #3 from marcopashkov/make-game-playable

game is playable
computer picks random (empty) fields
pick center, pick empty corner
temp commit

storing a generic approach for the __get_all_row_combinations__ function
finished winning pick
implemented blocking
implemented fork/block-fork
implemented oppisite-corner; finished perfect strategy
Merge pull request #4 from marcopashkov/computer-player

finished computer player