Vendor the external cookbooks

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

cookbooks/poise-build-essential/README.md

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+# Poise-Build-Essential Cookbook
+
+[![Build Status](https://img.shields.io/travis/poise/poise-build-essential.svg)](https://travis-ci.org/poise/poise-build-essential)
+[![Gem Version](https://img.shields.io/gem/v/poise-build-essential.svg)](https://rubygems.org/gems/poise-build-essential)
+[![Cookbook Version](https://img.shields.io/cookbook/v/poise-build-essential.svg)](https://supermarket.chef.io/cookbooks/poise-build-essential)
+[![Coverage](https://img.shields.io/codecov/c/github/poise/poise-build-essential.svg)](https://codecov.io/github/poise/poise-build-essential)
+[![Gemnasium](https://img.shields.io/gemnasium/poise/poise-build-essential.svg)](https://gemnasium.com/poise/poise-build-essential)
+[![License](https://img.shields.io/badge/license-Apache_2-blue.svg)](https://www.apache.org/licenses/LICENSE-2.0)
+
+A [Chef](https://www.chef.io/) cookbook to install a C compiler and build tools..
+
+## Quick Start
+
+To install a C compiler:
+
+```ruby
+include_recipe 'poise-build-essential'
+```
+
+Or to install using a resource and at compile time:
+
+```ruby
+poise_build_essential 'build_essential' do
+  action :nothing
+end.run_action(:install)
+```
+
+## Recipes
+
+* `poise-build-essential::default` – Install a C compiler and build tools.
+
+## Attributes
+
+* `node['poise-build-essential']['action']` – Action to use. One of install,
+  upgrade, or remove. *(default: install)*
+* `node['poise-build-essential']['allow_unsupported_platform']` – Whether or not
+  to raise an error on unsupported platforms. *(default: false)*
+
+## Resources
+
+### `poise_build_essential`
+
+The `poise_build_essential` resource installs a C compiler and build tools.
+
+```ruby
+poise_build_essential 'build_essential' do
+  allow_unsupported_platform true
+end
+```
+
+#### Actions
+
+* `:install` – Install a C compiler. *(default)*
+* `:upgrade` – Install a C compiler using `package action :ugprade` rules.
+* `:remove` – Remove a C compiler.
+
+#### Properties
+
+* `allow_unsupported_platform` – Whether or not to raise an error on unsupported
+  platforms. *(default: false)*
+
+## Sponsors
+
+Development sponsored by [SAP](https://www.sap.com/).
+
+The Poise test server infrastructure is sponsored by [Rackspace](https://rackspace.com/).
+
+## License
+
+Some code copyright 2008-2017, Chef Software, Inc. Used under the terms of the
+Apache License, Version 2.0.
+
+Copyright 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.