Fixes bug in Player#get_user_input
Resizes board, adds exit ability
Improves error message for empty space move
Separates Pawn#color_moves from #moves.
Separates Pawn#valid_two_forward from #moves
Removed extra newlines
Makes methods in Pawn private
Makes methods in Piece private
Makes methods in Board private
Makes methods in HumanPlayer private
Makes methods in Game private
Fixes gits spacing mistake
Cleaned up 'piece.rb'
Adds helper function to Board#dup
Cleans up 'board.rb'
Cleans up 'game.rb'
Adds winning messages
Added row numbers to Board#display
Adds column letters to Board#display
Converts input from chess notation