Prepare pubspec/CHANGELOG for version 0.1.2

lib/http.dart

 // Copyright (c) 2014, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Provides access to an authenticated HTTP client which can be used to access
 /// Google APIs.
 library gcloud.http;
 
 import 'package:http/http.dart' as http;
 
 import 'service_scope.dart' as ss;
 
 const Symbol _authenticatedClientKey = #_gcloud.http;
 
 /// Access the [http.Client] object available in the current service scope.
 ///
 /// The returned object will be the one which was previously registered with
 /// [registerAuthClientService] within the current (or a parent) service
 /// scope.
 ///
 /// Accessing this getter outside of a service scope will result in an error.
+/// See the `package:gcloud/service_scope.dart` library for more information.
 http.Client get authClientService => ss.lookup(_authenticatedClientKey);
 
 /// Registers the [http.Client] object within the current service scope.
 ///
 /// The provided `client` object will be avilable via the top-level
 /// `authenticatedHttp` getter.
 ///
 /// Calling this function outside of a service scope will result in an error.
 /// Calling this function more than once inside the same service scope is not
 /// allowed.
 void registerAuthClientService(http.Client client, {bool close: true}) {
   ss.register(_authenticatedClientKey, client);
   if (close) {
     ss.registerScopeExitCallback(() => client.close());
   }
 }