Update to 1.5104
    
    - New upstream release 1.5104
      - Add File::Path dependency for testing (CPAN RT#103482)
      - Don't install private Module::Install extension (CPAN RT#103482)
      - Clarify licensing terms
      - Move verbose testing to a private module, and implement it in a way that
        doesn't require editing the Makefile after it is generated
      - Require File::Slurp instead of including it, to avoid potential problems
        like this:
        http://www.cpantesters.org/cpan/report/86a0145a-e52b-11e4-a1d1-8536eb4f9f07
      - Improve the ability of the test suite to be run in parallel
      - Fix Windows test incompatibilities, such as:
        http://www.cpantesters.org/cpan/report/12187014-af8d-1014-92d8-fdf72a825c07
        http://www.cpantesters.org/cpan/report/12187014-af8d-1014-92d8-fdf72a825c07