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/BulletCollision/CollisionShapes/btCollisionShape.h

@@ -80,6 +80,11 @@ public:
 		return btBroadphaseProxy::isCompound(getShapeType());
 	}
 
+	SIMD_FORCE_INLINE bool	isSoftBody() const
+	{
+		return btBroadphaseProxy::isSoftBody(getShapeType());
+	}
+
 	///isInfinite is used to catch simulation error (aabb check)
 	SIMD_FORCE_INLINE bool isInfinite() const
 	{