Revision history for Process-Status

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