Update rockfile
Bump Etsy::StatsD dep to 1.001
Update tests to work with Etsy::StatsD 1.001
Update Changes
Add "rock dzil" for convenience
Release v0.22

  * Depend on Etsy::StatsD 1.001. This fixes a bug which would sometimes
    cause corrupted partial metrics to be sent (thanks Ricardo Signes and
    Steve Sanbeg).
  * Fix tests to pass with Etsy::StatsD 1.001.