[visionegg] response controller with no parallel port

Hi,
I was just going through the demos and found that in the demo_keyboardresponse.py the import of ResponseControl requires DaqLPT which requires a parallel port. This is frustrating for those without a parallel port trying to use this controller. I don't know the best way to handle this, I think an ifdef would be handy but right now I'm just commenting it out.

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