Added Contact:getFixtures and Body:getContactList (see issue #905).

The list of Contacts associated with bodies changes during World:update (potentially multiple times), so you might miss collisions if you don't use the World callbacks at all.

src/modules/physics/box2d/wrap_Contact.h

@@ -47,6 +47,7 @@ int w_Contact_resetRestitution(lua_State *L);
 int w_Contact_setTangentSpeed(lua_State *L);
 int w_Contact_getTangentSpeed(lua_State *L);
 int w_Contact_getChildren(lua_State *L);
+int w_Contact_getFixtures(lua_State *L);
 extern "C" int luaopen_contact(lua_State *L);
 
 } // box2d