moves chess files into a 'chess' folder
Renders board, refactors in_check? code
Notifies current player at start of turn if they're in check.
Adds chess.rb to run game and require necessary files, refactors code in board class and game class, adds unicode characters to individual piece classes, adds stalemate (tho limited) functionality.
Refactors pawn class.
Fixes unnecessary attr_accessor in game class
Adds castling (required rewriting in_check?), adds save game functionality.