+ 0.1.00 initial version (archive)
+ 0.1.01 refactor (archive only)
+ 0.1.02 updated comments (archive only)
+ 0.1.03 changed &= to *= (turbo pascal convention)
+ some optimizations
+ 0.1.04 support for + - *,
+ clean up code
+ first stable version.
+ 0.1.05 bug fixing - operator
+ performance count()
+ performance subset()
+ comments
+ removed isEmpty() - too simple
+ removed demo
+ added alltest example