bomb by beat
add some more NICE RULESETS ey
Some tweaks.
Performance-related refactoring in GOL density calculation.
Moved density calculation to calculateNextStates() method to avoid
having to loop twice through the array.
move known good rule sets under RuleSet
Merge pull request #20 from jukkae/gol-tweaks

Gol tweaks
Add good rulesets
Merge pull request #21 from jukkae/gol-tweaks

Add good rulesets
Merge branch 'master' of https://github.com/jukkae/into-dangerzone into boids-tweaks