first commit
adds Chess class with play loop
adds chessboard
adds empty chesspieces class
adds comment code to player class
added knight possible moves
Makes new board
allows printing of the board
finishes player input loop, playable with knight only
adds unicode characters instead of u code
adds functionality for remaining pieces
adds in_check? functionality
fixed is_check
checkmate works, game works
win message working
fixes pawn and king possible moves
adds saving, loading from arguments
removes player instance variables
refactors chess and chessboard
refactors chessboard.rb some more