Add option for setting up callbacks so that a minimum pulse width can be specified - to help avoid spurious callbacks due to noisy spikes.
This could also be used to detect button holds.
(Originally requested by @cymplecy)
See http://www.raspberrypi.org/forums/viewtopic.php?f=32&t=95809
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See http://www.raspberrypi.org/forums/viewtopic.php?f=32&t=95809