add a simple description (doc) to ProcessInfo
actually hide ProcessKillException - we do not want anyone to be able
to catch one of these and override the behaviour of `kill'
cosmetic
implement 'die' - terminates the calling process immediately by
throwing ProcessExitException with the supplied reason. Closes #110.
changing the ProcessKillException 'show' output broke the tests - fix
align the documentation for die and terminate
test 'die'
make ProcessExitException's show look nice when reason :: String
use simpler description when showing ProcessExitException
test show instance for ProcessExitException
Merge branch 'showy-exit-messages'