Vendor the external cookbooks

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

cookbooks/users/libraries/matchers.rb

@@ -0,0 +1,15 @@
+if defined?(ChefSpec)
+  ChefSpec.define_matcher :users_manage
+
+  def create_users_manage(resource_name)
+    ChefSpec::Matchers::ResourceMatcher.new(:users_manage,
+                                            :create,
+                                            resource_name)
+  end
+
+  def remove_users_manage(resource_name)
+    ChefSpec::Matchers::ResourceMatcher.new(:users_manage,
+                                            :remove,
+                                            resource_name)
+  end
+end