Remove test elapsed time
Fix return value in b2.BodyDef.linear_velocity
Allow temporary shape instance (keep a ref)
Fix comment

user data became user media due to a recent refactoring
Fix example media path
Ignore log when copy deb files
Fix return value of b2.Fixture.test_point
Fix return value of b2.Transform.position
Fix b2.RayCastOutput.normal.__set__
Make b2.Shape abstract
Rm dbg msg
Fix readversion (stop when version has been read
to avoid reading junk)
Fix b2.MassData.I setter
Fix return value of b2.Shape.test_point
Fix typo in comment
Fix b2.ShapeType
Add b2 tests (not finished)