fix tests: using /home/vagrant as base
upgrade to latest test-kitchen etc
Include the unf gem to make fog happier
no more need of some stemcell_builder packages
Bump version of bundler installed
install latest bosh_cli gems
defaulting to ext4 now as no longer need btrfs for stemcell building; as it uses its own vagrant box
Merge pull request #60 from cloudfoundry-community/upgrades

Upgrades