Updated to Box2D 2.2, added new joints, some other updates to match the API changes (still plenty more to go though)

--HG--
branch : box2d-update

src/modules/physics/box2d/wrap_WeldJoint.cpp

@@ -0,0 +1,52 @@
+/**
+* Copyright (c) 2006-2011 LOVE Development Team
+* 
+* This software is provided 'as-is', without any express or implied
+* warranty.  In no event will the authors be held liable for any damages
+* arising from the use of this software.
+* 
+* Permission is granted to anyone to use this software for any purpose,
+* including commercial applications, and to alter it and redistribute it
+* freely, subject to the following restrictions:
+* 
+* 1. The origin of this software must not be misrepresented; you must not
+*    claim that you wrote the original software. If you use this software
+*    in a product, an acknowledgment in the product documentation would be
+*    appreciated but is not required.
+* 2. Altered source versions must be plainly marked as such, and must not be
+*    misrepresented as being the original software.
+* 3. This notice may not be removed or altered from any source distribution.
+**/
+
+#include "wrap_WeldJoint.h"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	WeldJoint * luax_checkweldjoint(lua_State * L, int idx)
+	{
+		return luax_checktype<WeldJoint>(L, idx, "WeldJoint", PHYSICS_WELD_JOINT_T);
+	}
+	
+	static const luaL_Reg functions[] = {
+		// From Joint.
+		{ "getType", w_Joint_getType },
+		{ "getAnchors", w_Joint_getAnchors },
+		{ "getReactionForce", w_Joint_getReactionForce },
+		{ "getReactionTorque", w_Joint_getReactionTorque },
+		{ "getCollideConnected", w_Joint_getCollideConnected },
+		{ "destroy", w_Joint_destroy },
+		{ 0, 0 }
+	};
+
+	int luaopen_weldjoint(lua_State * L)
+	{
+		return luax_register_type(L, "WeldJoint", functions);
+	}
+
+} // box2d
+} // physics
+} // love