Get rid of mass in fixed-mass layouts.
Get rid of unsused methods.
First half of BarnesHut implemented.
Allow to give initial positions into SpringLayouts.
Improve BarnesHutLayout.
Add spec for barnes hut.
Fix for barnes hut.
Add rich incremental layout, to ease running multiple steps.
More tests for barnes hut.
Test with different thetas.
Code cleanup.
Performance tuning.
Rename Vector3 to MutableVector.
Move vectors into its own utils.vector package.
Rename Vec3 to Vector3.
Proper names for vector conversion methods.
Move Box3 into own file and change naming.
Get rid of mutable box.
Position now maps to Vector3 instead of MutableVector3.
More cross mutable/immutable methods on vectors.