Vendor the external cookbooks

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

cookbooks/compat_resource/files/lib/compat_resource.rb

@@ -0,0 +1,35 @@
+require "chef/version"
+
+if Gem::Requirement.new(">= 12.0").satisfied_by?(Gem::Version.new(Chef::VERSION))
+
+  require 'chef_compat/resource'
+  require 'chef_compat/property'
+  require 'chef_compat/mixin/properties'
+
+  resources_dir = File.expand_path("chef_compat/copied_from_chef/chef/resource", File.dirname(__FILE__))
+  providers_dir = File.expand_path("chef_compat/copied_from_chef/chef/provider", File.dirname(__FILE__))
+  Dir["#{resources_dir}/*.rb"].each {|file| require file }
+  Dir["#{providers_dir}/*.rb"].each {|file| require file }
+else
+
+  class Chef
+    class Resource
+      def self.property(args, &block)
+        raise_chef_11_error
+      end
+
+      def self.resource_name(args, &block)
+        raise_chef_11_error
+      end
+
+      def self.action(args, &block)
+        raise_chef_11_error
+      end
+
+      def self.raise_chef_11_error
+        raise "This resource is written with Chef 12.5 custom resources, and requires at least Chef 12.0 used with the compat_resource cookbook, it will not work with Chef 11.x clients, and those users must pin their cookbooks to older versions or upgrade."
+      end
+    end
+  end
+
+end