Fix META

Various [Kwalitee](http://cpants.cpanauthors.org/dist/FusionInventory-Agent-2.3.2) fixes for this distribution to be a better CPAN citizen.

See those posts for details:
- http://weblog.bulknews.net/post/44251476706/stop-shipping-mymeta-to-cpan
- http://fr.perlmaven.com/comment-ajouter-le-lien-vers-le-systeme-de-controle-de-versions-d-une-distribution-cpan