peterlane/chess_data: Library for searching/filtering datasets of chess games based on combinations of pieces.

Peter Lane 220aa7c17b Added error checking on games		4 lat temu
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data	975905717c fixed encoding to iso-8859-1	11 lat temu
board_test.rb	49a0532a19 updated tests for minitest 5.13	4 lat temu
database_test.rb	49a0532a19 updated tests for minitest 5.13	4 lat temu
game_test.rb	220aa7c17b Added error checking on games	4 lat temu
moves_test.rb	220aa7c17b Added error checking on games	4 lat temu
position-definition_test.rb	49a0532a19 updated tests for minitest 5.13	4 lat temu