Oh all kinds of good times happened.  Checkmate works, I think.  Maybe.  Stalemate might work.  Well, the "stuck" version anyway.

Castling still doesn't work.  Not really sure why.  The methods seem to spit out the right results, but... nope.  Weird.

Signed-off-by: unknown <JML00@JOSHL-LT.AcuityLightingGroup.com>
Just added a brief note in README about castling.