apply patch to allow soft body rayTest. Minor change in patch: test for current hitfraction, so only report hits closer than current closest hit fraction.

Thanks to Benoit Bolsee for the patch, see Issue 311
http://code.google.com/p/bullet/issues/detail?id=311

src/BulletSoftBody/btSoftRigidDynamicsWorld.h

@@ -80,6 +80,18 @@ public:
 		return m_softBodies;
 	}
 
+
+	virtual void rayTest(const btVector3& rayFromWorld, const btVector3& rayToWorld, RayResultCallback& resultCallback) const; 
+
+	/// rayTestSingle performs a raycast call and calls the resultCallback. It is used internally by rayTest.
+	/// In a future implementation, we consider moving the ray test as a virtual method in btCollisionShape.
+	/// This allows more customization.
+	static void	rayTestSingle(const btTransform& rayFromTrans,const btTransform& rayToTrans,
+					  btCollisionObject* collisionObject,
+					  const btCollisionShape* collisionShape,
+					  const btTransform& colObjWorldTransform,
+					  RayResultCallback& resultCallback);
+
 };
 
 #endif //BT_SOFT_RIGID_DYNAMICS_WORLD_H