ref #23 : fixed some syntax errors in class Plane
ref #23 : added function to class AxisAlignedBoundingBox, added constructor to class PLane and fixed Constructor in class ViewFrustum
ref #23 : fixed missing initialization in CullingVisitor
ref #23 : merged with newer version of scenegraph_2 and applied coding standards
Merge pull request #99 from cgcostume/culling2_23

merge Culling2 23 into scenegraph_2