Revision history for Process-Status

0.008     2019-02-15 11:16:23-05:00 America/New_York
        - fix behavior of assert_ok on negative statuses (thanks, Michael
          McClimon)

0.007     2015-11-25 23:15:24-05:00 America/New_York
        - add assert_ok method

0.006     2015-11-03 10:29:45-05:00 America/New_York
        - document as_string (thanks, Alexander Karelas!)

0.005     2014-06-26 15:58:45-04:00 America/New_York
        - remove bizarre mis-use of pid_t; it's now status_code

0.003     2014-04-01 14:33:56-04:00 America/New_York
        - handle negative $? better (it's what you get if you say
          `this-does-not-exist`)

0.002     2013-12-31 12:34:55 America/New_York
        - tweaks here and there, mostly add ->as_string

0.001     2013-12-30 12:19:59 America/New_York
        - first release
