11/09/2015 v 1.4	Proc::Fork::Control should use cfork_exit() internally to
			to avoid losing exit signals.

			Avoid excessive delays in blocking mode while at the same
			time keeping CPU usage down.

			Improved documentation on cfork_nonblocking() mode

11/08/2015 v 1.3	Time::HiRes is now required
10/03/2014 v.1.2	Initial public release