Switch to using the dep tool and update all the dependencies

vendor/cloud.google.com/go/authexample_test.go

@@ -0,0 +1,49 @@
+// Copyright 2016 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 cloud_test
+
+import (
+	"cloud.google.com/go/datastore"
+	"golang.org/x/net/context"
+	"google.golang.org/api/option"
+)
+
+func Example_applicationDefaultCredentials() {
+	// Google Application Default Credentials is the recommended way to authorize
+	// and authenticate clients.
+	//
+	// See the following link on how to create and obtain Application Default Credentials:
+	// https://developers.google.com/identity/protocols/application-default-credentials.
+	client, err := datastore.NewClient(context.Background(), "project-id")
+	if err != nil {
+		// TODO: handle error.
+	}
+	_ = client // Use the client.
+}
+
+func Example_serviceAccountFile() {
+	// Use a JSON key file associated with a Google service account to
+	// authenticate and authorize. Service Account keys can be created and
+	// downloaded from https://console.developers.google.com/permissions/serviceaccounts.
+	//
+	// Note: This example uses the datastore client, but the same steps apply to
+	// the other client libraries underneath this package.
+	client, err := datastore.NewClient(context.Background(),
+		"project-id", option.WithServiceAccountFile("/path/to/service-account-key.json"))
+	if err != nil {
+		// TODO: handle error.
+	}
+	_ = client // Use the client.
+}