Add support for Namespace as Kind

Add example for using namespaces

pkg/registry/namespace/registry.go

@@ -0,0 +1,48 @@
+/*
+Copyright 2014 Google Inc. All rights reserved.
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+package namespace
+
+import (
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/api"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic"
+	etcdgeneric "github.com/GoogleCloudPlatform/kubernetes/pkg/registry/generic/etcd"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/runtime"
+	"github.com/GoogleCloudPlatform/kubernetes/pkg/tools"
+)
+
+// registry implements custom changes to generic.Etcd for Namespace storage
+type registry struct {
+	*etcdgeneric.Etcd
+}
+
+// NewEtcdRegistry returns a registry which will store Namespace objects in the given EtcdHelper.
+func NewEtcdRegistry(h tools.EtcdHelper) generic.Registry {
+	return registry{
+		Etcd: &etcdgeneric.Etcd{
+			NewFunc:      func() runtime.Object { return &api.Namespace{} },
+			NewListFunc:  func() runtime.Object { return &api.NamespaceList{} },
+			EndpointName: "namespaces",
+			KeyRootFunc: func(ctx api.Context) string {
+				return "/registry/namespaces"
+			},
+			KeyFunc: func(ctx api.Context, id string) (string, error) {
+				return "/registry/namespaces/" + id, nil
+			},
+			Helper: h,
+		},
+	}
+}