Log Message:
ruby-jirametrics: update to 2.10. Changes:

- Cycletime Histogram improvements
    - Added a collection of statistics under the chart. Thanks to
      Fernando Cuenca for the contribution.
    - Added percentile lines on the chart.
- Bug: Fixed exception in rare case when comparing output rows
- Bug: Fixed some timezone logic, for which the unit tests only failed
  when being run somewhere other than the Pacific Timezone.