Added a destroy() function to Bitboard.java.
Added an init() function to Main.java.
Added a destroy() function to Main.java.
Changed the name of Masks.java to BBMasks.java to try and match a better
description of what it is.
Changed the name of Bitboard.java to BBOperators.java to give a better
descriptive name to the class.
Changed the name of MasksTest.java to BBMasksTest.java to match the
change from Masks.java to BBMasks.java.