Renamed OctreeNode::BoundingBoxType typedef

Renamed OctreeNode::BoundingBoxType to AxisAlignedBoundBox to be clear
that this is an "Axis Aligned" bounding box.
Added another test for OctreePath

Added another test of the OctreePath with the OctreeShape. This test
tests a valid non-null path.
Fixed formatting and comments in Octree

Fixed whitepace formatting and added missing doxygen comments to the
OctreeDcdContact, OctreeNode, and OctreeShape.