Log Message:
Update to 1.15

Upstream changes:
1.15 2015-11-27
   - Bugfix: should not ignore seed value of 0 (reported by Maxim Tyukov)
   - Exclude MYMETA files from tarball (#108108, reported by Alexandr Ciornii)

1.14 2015-10-19
   - Stricter Kwalitee directory testing (#107821, reported by Slaven Rezi�)
   - Moved some non-essential tests to xt/ (#101282, reported by Slaven Rezi�)

1.13 2013-10-30
    - Changes file as per CPAN::Changes::Spec (#88672, patch by Neil Bowers)

1.12 2013-09-14
    - Improvement of unit tests, restored some as author-side only (#88637)