Merge pull request #3 from thijser/feature-geometry_intersection

Stub on feature for geometry intersection
Created debugging output after shooting a ray with 'd'.
Merge pull request #4 from thijser/feature-debugging_ray

Created debugging output after shooting a ray with 'd'.
Wups I broke stuff
Merge pull request #5 from thijser/feature-debugging_ray

Wups I broke stuff
Fixes?
Merge pull request #6 from thijser/feature-debugging_ray

Fixes?
Merge remote-tracking branch 'origin/master' into feature-bounding_box_collision