added get/setGroupIndex to CircleShape and PolygonShape

src/modules/physics/box2d/wrap_CircleShape.cpp

@@ -83,6 +83,8 @@ namespace box2d
 		{ "setData", w_Shape_setData },
 		{ "getData", w_Shape_getData },
 		{ "getBoundingBox", w_Shape_getBoundingBox },
+		{ "getGroupIndex", w_Shape_getGroupIndex },
+		{ "setGroupIndex", w_Shape_setGroupIndex },
 		{ "destroy", w_Shape_destroy },
 		{ 0, 0 }
 	};