Add VersionID to impl/memory info service implementation

impl/memory/info.go

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 package memory
 
 import (
         "fmt"
         "regexp"
 
@@ skipping 49 matching lines @@
         return gi.appid
 }
 
 func (gi *giImpl) FullyQualifiedAppID() string {
         return gi.appid
 }
 
 func (gi *giImpl) IsDevAppServer() bool {
         return true
 }
+
+func (gi *giImpl) VersionID() string {
+        // VersionID returns X.Y where Y is autogenerated by appengine, and X is
+        // whatever's in app.yaml.
+        return "testVersionID.1"
+}