Switch to ruby-manager-agnostic files
Update berks, gems and remove Vagrantfile

Vagrantfile is not needed with the new test-kitchen and Berkshelf
integration
Upgrade chef omnibus installation for test

Beefs up resources to help with compilation times for custom rubies
Re-factor default recipe

Now fully converges and installs. Needs more test coverage to make sure
the deploy completes and the app starts successfully.