Add Rake task test:cleanup and run it at exit
Remove Vagrant from Gem dependencies and update Berkshelf
Remove Berkshelf Vagrant plugin from Vagrantfile
Update README
Update foodcritic to version 2.0.1
Add minitest-handler to cookbook dependencies
Add minitest-handler to run list in Vagrantfile
Only run minitest-handler if INTEGRATION_TEST is defined
Add minitest test
Add Rake task test:integration
Do not run integration tests on Travis
Add chapter on minitest to README
Add Rake task test:integration_teardown
Check if there are any integration tests first