chipmunk: bindings for DampedSprings
chipmunk: create native properties accessors for DampedSpring
chipmunk: properties for Constraint
chipmunk: cpBody: complete binding
chipmunk: stop leaking all the native structs
chipmunk: complete Shape binding
chipmunk: complete Space binding
chipmunk: pinjoints, slidejoints, pivotjoints, groovejoints