adds getOptions, changes some option names and changes undoLastMove to use move.getPositionAfter
(instead of getResultingFen) in chess Game
adds getPositionAfter to history Move and removes getResultingFen from it and chess Move
adds getCapturedPiece and removes getDot in chess Move
changes getResultingFen to getPositionAfter().getFen() in chess Game checkThreefold
removes options from server Game (pass through to inner Game instead) and adds server Move
adds _sendOne and _sendMany to User to allow the send(url, data) form