Port to Moo

This pull request does:

* port implementation from Moose to Moo
* port build stuff from Module::Package::RDF to Dist::Inkt (because the latter plays nice with Travis)
* gets travis builds working
* gets full marks on the `cpants_lint.pl` command-line release linter (which doesn't mean it would necessarily get full marks on http://cpants.cpanauthors.org as the latter includes some extra tests).