fix the problem that sometimes the body been rendered in the wrong position in ie11
fix the problem that sometimes the body been rendered in the wrong position in ie11

I don't know whether to add two temporary variables to store the values of "2 * hw + 2 + (2 * styles.lineWidth|0)" and "2 * hh + 2 + (2 * styles.lineWidth|0)",then assign them to hiddenCanvas.width,hiddenCanvas.height,view.width and view.height for improving a little performance.
Nayar/PhysicsJS,jpellerin/PhysicsJS,haithemaraissia/PhysicsJS,eric-seekas/PhysicsJS,Nayar/PhysicsJS,haithemaraissia/PhysicsJS,griever989/PhysicsJS,pietro909/PhysicsJS,aldeed/PhysicsJS,pietro909/PhysicsJS,mcanthony/PhysicsJS,VANITAX/PhysicsJS,eric-seekas/PhysicsJS,jpellerin/PhysicsJS,Rawneed/PhysicsJS,131/PhysicsJS,mcanthony/PhysicsJS,rohit765/PhysicsJS,rohit765/PhysicsJS,Luwdo/PhysicsJS,wellcaffeinated/PhysicsJS,griever989/PhysicsJS,VANITAX/PhysicsJS,Luwdo/PhysicsJS,aldeed/PhysicsJS,Rawneed/PhysicsJS,wellcaffeinated/PhysicsJS