Moved distribution close to being "CPANTS clean"

Hi Ali,

This has a number of minor changes to get the distribution following various CPAN conventions:

 * Added a Changes file, which follows conventions in CPAN::Changes::Spec
 * Added an abstract to the pod
 * Specified min version of perl (based on perlver, which is in the Perl::MinimumVersion dist)
 * Added a SEE ALSO section to the pod

The only thing CPANTS doesn't like now is the fact that the CPAN distribution doesn't contain a README. Is there a dzil plugin that will render your README.md as README, to include in the release?

Cheers,
Neil