lookAt fails if looking to its own position

[rdoi]

Maybe related also to: #684

To replicate:

  var m:WireframeCube= new WireframeCube();
  scene.addChild(m);
  m.lookAt(m.scenePosition.clone());
  trace(m.scenePosition); // <- returns ( Vector3D(NaN, NaN, NaN) );

Sure that looking to its own position makes no sense, but the engine shouldn't invalidate its transform matrix because of that. I think it should simply ignore the instruction when it happens.

[flashbladez]

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