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/Physics.h

@@ -36,6 +36,7 @@
 #include "RevoluteJoint.h"
 #include "PulleyJoint.h"
 #include "GearJoint.h"
+#include "FrictionJoint.h"
 
 namespace love
 {
@@ -200,6 +201,13 @@ namespace box2d
 		**/
 		GearJoint * newGearJoint(Joint * joint1, Joint * joint2, float ratio);
 
+		/**
+		* Creates a new FrictionJoint connecting body1 with body2.
+		* @param x Anchor along the x-axis. (World coordinates)
+		* @param y Anchor along the y-axis. (World coordinates)
+		**/
+		FrictionJoint * newFrictionJoint(Body * body1, Body * body2, float x, float y);
+
 
 	}; // Physics