Log Message:
Update to 0.53

Upstream changes:
0.50 Sat May  9 09:06:41 EDT 2015
    - Improve performance of is_LsubsetR via patches submitted by Mich Rawson
      at New York Perl Hackathon (May 2 2015).

0.51 Thu May 14 21:49:00 EDT 2015
    - Changes to List::Compare::Functional::is_LsubsetR introduced in v0.50
      found to be buggy.  See: https://rt.cpan.org/Ticket/Display.html?id=104452.
      Pending further investigation, reverted to v0.49 of
      List::Compare::Base::_Auxiliary; added two test files.

0.52 Thu May 21 21:57:18 EDT 2015
    - v0.51 changes were not applied to master branch; apply them.
      Remove two hash-to-hash assignments in \ 
List::Compare::Base::_Auxiliary::_subset_subengine.

0.53 Sun Jun  7 10:49:24 MDT 2015
    - Accept patch submitted by Paulo Custodio reworking, and correcting,
      changes originally published in 0.50.