Merge pull request #157 from fvalenza/devel

python/bindings_SE3.py

python/bindings_force.py

python/bindings_frame.py

python/bindings_geometry_object.py

python/bindings_inertia.py

python/bindings_motion.py

python/tests.py

src/algorithm/operational-frames.hpp

src/multibody/model.hxx

src/python/frame.hpp

src/spatial/frame.hpp