Add support for Namespace as Kind

Add example for using namespaces

pkg/registry/event/rest.go

@@ -72,7 +72,7 @@ func (rs *REST) Update(ctx api.Context, obj runtime.Object) (<-chan apiserver.RE
 	if !ok {
 		return nil, fmt.Errorf("not an event object: %#v", obj)
 	}
-	if api.Namespace(ctx) != "" {
+	if api.NamespaceValue(ctx) != "" {
 		if !api.ValidNamespace(ctx, &event.ObjectMeta) {
 			return nil, errors.NewConflict("event", event.Namespace, fmt.Errorf("event.namespace does not match the provided context"))
 		}