Implement to_mat4 for Transform3D and quaternion
Add a translate builder for Transform3D
Merge pull request #37 from csherratt/master

Add a translate constructor for Transform3D.
Rotation2 and Rotation3 improved with from_* methods. Betwee_vecs implemented for all rotations.
Axis-aligned boxes use top and bottom corners

Fixes issue #35.
Merge pull request #39 from kvark/t-quat-arc

between_vecs implementation, Rotation traits improvement
Merge pull request #38 from rsaarelm/master

Axis-aligned boxes use top and bottom corners
Merge remote-tracking branch 'bjz/master' into gamedev-kit