A crude attempt to group some vectors to make things faster.
A fewcosmetic changes
Merge branch 'master' of https://github.com/nippur72/Dart.RayTracerDemo
Merge pull request #11 from mdakin/master

Group vectors to exploit cache effects.
Merge pull request #13 from slavap/master

Merge pull request #2 from nippur72/master
Merge pull request #3 from nippur72/master

Update from origin