Human mapping for spark is finished

Note that spark was also updated to take 50 joints.
[human] fix docstring
Update kinect calibration
[cmake] Compute PYTHONLIBS_VERSION_STRING only if patchlevel.h is found

Fix the weird cmake message error when PYTHON_INCLUDE_DIR is not found
for the desired python version.
[ros] do not create topic for TF only publisher

fix #317
Enable human positionning with the wiimote.
[helpers] math: add print_matrix44, fix typos

simplify transformation3d.update to use the Blender matrix.to_4x4() function
[helpers] add rotation properties to transformation3d