Vendor the external cookbooks

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

cookbooks/homebrew/libraries/matchers.rb

@@ -0,0 +1,28 @@
+if defined?(ChefSpec)
+  ChefSpec.define_matcher :homebrew_package
+
+  def tap_homebrew_tap(tap)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_tap, :tap, tap)
+  end
+
+  def untap_homebrew_tap(tap)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_tap, :untap, tap)
+  end
+
+  def cask_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :cask, cask)
+  end
+
+  def uncask_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :uncask, cask)
+  end
+
+  def install_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :install, cask)
+  end
+
+  def uninstall_homebrew_cask(cask)
+    ChefSpec::Matchers::ResourceMatcher.new(:homebrew_cask, :uninstall, cask)
+  end
+
+end