Cleaning BoardImplementation.
Simplified adjustFriendlyNeighbors.
Implemented playFast.
Remove a TODO.
Proposed hash is now stored rather than recomputed.
Created public isLegal.
Removed an unused method.
Removed reference to old Board class in SuperKoTable.
Renamed BoardImplementation to Board.
Added package comment for edu.lclark.orego.core.
Made the array of primes in SimpleRandom shorts instead of ints.