add vendoring with go dep

vendor/github.com/vmware/govmomi/vim25/mo/reference.go

@@ -0,0 +1,26 @@
+/*
+Copyright (c) 2015 VMware, 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 mo
+
+import "github.com/vmware/govmomi/vim25/types"
+
+// Reference is the interface that is implemented by all the managed objects
+// defined in this package. It specifies that these managed objects have a
+// function that returns the managed object reference to themselves.
+type Reference interface {
+	Reference() types.ManagedObjectReference
+}