First boids implementation. Also add math.Vector2D and math.Constants.
Merge branch 'master' of https://github.com/jukkae/into-dangerzone.git into boids
bug fix & parametric changes
Merge pull request #15 from jukkae/boids

Boids
Merge branch 'master' into audiomanager
Patch LTree and Boids to use the new audio handling