Piece tests. Board_detector not working for some reason. CHANGE DIFF

board_detector.py

game.py

ocr_test_images/piece_test1-1.jpg

ocr_test_images/piece_test1-10.jpg

ocr_test_images/piece_test1-2.jpg

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ocr_test_images/piece_test_castling1-1.jpg

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ocr_test_images/piece_test_castling1-5.jpg

ocr_test_images/piece_test_fast1-1.jpg

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ocr_test_images/piece_test_fast1-3.jpg