begin chess: start Board class
board.rb: add method to place a piece on the board
piece.rb: begin writing Piece and SlidingPiece
add Bishop, Rook, and Queen pieces
piece.rb: begin writing SteppingPiece
tighten up protection of move_dirs methods
write King and Knight classes
write Pawn
piece.rb: add some defensiveness to Piece
pieces.rb: add new pieces
piece.rb: fix bug
knight.rb: fix typo

who isn't doing TDD?
board.rb: should set itself up
pieces should render themselves
write Board#render
piece.rb: fix typo
pawn.rb: fix typos
pawn.rb: add ability to move two spaces
piece.rb: add Piece pos accessors

Board is going to need to modify this when performing a move
Write Board#move_piece