Polyhedra implementation + examples (Contributed by Jan Elias).
adding examples with tetrehadron modeled by new Polyhedron class
Remove some warnings.
Update numpy_boost.hpp from svn.
CombinedKinematicEngine will not call its 'dead' subengines (question #237437)
Remove executes bit on py, cpp and h-files.
Merge remote-tracking branch 'upstream/master'