Log Message:
Update p5-Time-Duration-Parse to 0.13.

0.13 2015-10-25 NEILB
    - Added additional abbrevations for 'months': 'mo', 'mon', 'mons'.
      Thanks to PERLANCAR.
    - Rewrote the main testsuite to be data driven, to make it easy to
      add test cases, as for the above change.
    - Updated github repo URL after changing my github username