feature re #37 methods transform world/body coords
feature re #37 methods transform world/body coords

rohit765/PhysicsJS,wellcaffeinated/PhysicsJS,haithemaraissia/PhysicsJS,eric-seekas/PhysicsJS,Rawneed/PhysicsJS,Luwdo/PhysicsJS,mcanthony/PhysicsJS,Rawneed/PhysicsJS,pietro909/PhysicsJS,griever989/PhysicsJS,haithemaraissia/PhysicsJS,Nayar/PhysicsJS,rohit765/PhysicsJS,mcanthony/PhysicsJS,Luwdo/PhysicsJS,wellcaffeinated/PhysicsJS,VANITAX/PhysicsJS,jpellerin/PhysicsJS,eric-seekas/PhysicsJS,pietro909/PhysicsJS,jpellerin/PhysicsJS,Nayar/PhysicsJS,VANITAX/PhysicsJS,griever989/PhysicsJS