fix de light.py et ajout des tests

__pycache__/camera.cpython-33.pyc

__pycache__/intersection.cpython-33.pyc

__pycache__/light.cpython-33.pyc

__pycache__/operation_vector.cpython-33.pyc

__pycache__/raytracer.cpython-33.pyc

__pycache__/scene.cpython-33.pyc

camera.py

light.py

one_sphere.png

operation_vector.py

raytracer.py

scene.py

script_one_sphere.py

tests/01_camera_ok.py

tests/02_rayon_ok.py

tests/03_sphere_intersection_ok.py

tests/04_material_ok.py

tests/05_phong_ok.py