Support 0.13.1

Hi,

Thanks for your cookbook.  I wanted to upgrade to 0.13.1 and it appears this is the minimal requirements to get there.

P.S. I had to bump the kitchen box to 14.04 as the current version was failing on the update notifier not being authenticated.  When running apt-get update by hand it appears the Raring box is getting 404's on indices.

Thanks!