Vendor the external cookbooks

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

cookbooks/ark/libraries/platform_specific_builders.rb

@@ -0,0 +1,23 @@
+module Ark
+  module PlatformSpecificBuilders
+    def generates_archive_commands_for(_name, options)
+      condition = options[:when_the]
+      builder = options[:with_klass]
+      archive_command_generators.push [condition, builder]
+    end
+
+    def archive_command_generators
+      @archive_command_generators ||= []
+    end
+
+    def generates_owner_commands_for(_name, options)
+      condition = options[:when_the]
+      builder = options[:with_klass]
+      owner_command_generators.push [condition, builder]
+    end
+
+    def owner_command_generators
+      @owner_command_generators ||= []
+    end
+  end
+end