Vendor the external cookbooks

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

cookbooks/homebrew/resources/cask.rb

@@ -0,0 +1,14 @@
+actions :cask, :uncask, :install, :uninstall
+default_action :install
+
+attribute :name,
+  name_attribute: true,
+  kind_of: String,
+  regex: /^[\w-]+$/
+
+attribute :options,
+  kind_of: String
+
+def casked?
+  shell_out('/usr/local/bin/brew cask list 2>/dev/null').stdout.split.include?(name)
+end

cookbooks/homebrew/resources/tap.rb

@@ -0,0 +1,31 @@
+#
+# Author:: Joshua Timberman (<jtimberman@chef.io>)
+# Author:: Graeme Mathieson (<mathie@woss.name>)
+# Cookbook:: homebrew
+# Resources:: tap
+#
+# Copyright:: 2011-2016, Chef Software, Inc.
+#
+# 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.
+#
+
+actions :tap, :untap
+default_action :tap
+
+attribute :name,
+          name_attribute: true,
+          kind_of: String,
+          regex: %r{^[\w-]+(?:\/[\w-]+)+$}
+
+attribute :tapped,
+          kind_of: [TrueClass, FalseClass]