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/WeldJoint.cpp

@@ -0,0 +1,51 @@
+/**
+* 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 "WeldJoint.h"
+
+#include <common/math.h>
+
+// Module
+#include "Body.h"
+#include "World.h"
+
+namespace love
+{
+namespace physics
+{
+namespace box2d
+{
+	WeldJoint::WeldJoint(Body * body1, Body * body2, float x, float y)
+		: Joint(body1, body2), joint(NULL)
+	{	
+		b2WeldJointDef def;
+		def.Initialize(body1->body, body2->body, world->scaleDown(b2Vec2(x,y)));
+		joint = (b2WeldJoint*)createJoint(&def);
+	}
+
+	WeldJoint::~WeldJoint()
+	{
+		destroyJoint(joint);
+		joint = 0;
+	}
+
+} // box2d
+} // physics
+} // love