add test-kitchen
modify README to describe this fork
Merge branch 'test-kitchen' into fork

* test-kitchen:
  add test-kitchen
remove vagrant
replace berkshelf with librarian
remove chef-vault
remove app_server_proxy and load_balancer recipes
add tmp and .librarian to gitignore
add basic serverspec tests
remove nginx dependency
update default version and checksum to latest
Revert "update default version and checksum to latest"

This reverts commit 5f80be3118eacdc29eb03318c63a01331bafe1bc.
Merge pull request #1 from cwjohnston/fork

Fork this cookbook from RiotGames/nexus-cookbook for our own purposes