Vendor the external cookbooks

Knife-Zero doesn't include Berkshelf support, so vendoring everything in
the repo is convenient again

cookbooks/poise-ruby-build/README.md

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+# Poise-Ruby-Build Cookbook
+
+[![Build Status](https://img.shields.io/travis/poise/poise-ruby-build.svg)](https://travis-ci.org/poise/poise-ruby-build)
+[![Gem Version](https://img.shields.io/gem/v/poise-ruby-build.svg)](https://rubygems.org/gems/poise-ruby-build)
+[![Cookbook Version](https://img.shields.io/cookbook/v/poise-ruby-build.svg)](https://supermarket.chef.io/cookbooks/poise-ruby-build)
+[![Coverage](https://img.shields.io/codecov/c/github/poise/poise-ruby-build.svg)](https://codecov.io/github/poise/poise-ruby-build)
+[![Gemnasium](https://img.shields.io/gemnasium/poise/poise-ruby-build.svg)](https://gemnasium.com/poise/poise-ruby-build)
+[![License](https://img.shields.io/badge/license-Apache_2-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+
+A [ruby-build](https://github.com/sstephenson/ruby-build) provider for the
+[poise-ruby cookbook](https://github.com/poise/poise-ruby).
+
+## Provider
+
+The `ruby_build` provider uses [ruby-build](https://github.com/sstephenson/ruby-build)
+to compile and install Ruby.
+
+```ruby
+ruby_runtime 'myapp' do
+  provider :ruby_build
+  version '2.1'
+end
+```
+
+### Options
+
+* `install_doc` – Install documentation with Ruby. *(default: false)*
+* `install_repo` – Git URI to clone to install ruby-build. *(default: https://github.com/sstephenson/ruby-build.git)*
+* `install_rev` – Git revision to clone to install ruby-build. *(default: master)*
+* `prefix` – Base path for install ruby-build and rubies. *(default: /opt/ruby_build)*
+* `version` – Override the Ruby version.
+
+## Sponsors
+
+Development sponsored by [Bloomberg](http://www.bloomberg.com/company/technology/).
+
+The Poise test server infrastructure is sponsored by [Rackspace](https://rackspace.com/).
+
+## License
+
+Copyright 2015-2017, Noah Kantrowitz
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.