Prepare pubspec/CHANGELOG for version 0.1.2

lib/db.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.
 
 library gcloud.db;
 
 import 'dart:async';
 import 'dart:collection';
 import 'dart:mirrors' as mirrors;
 
 import 'common.dart' show Page, StreamFromPages;
 import 'service_scope.dart' as ss;
 import 'datastore.dart' as datastore;
 
 part 'src/db/annotations.dart';
 part 'src/db/db.dart';
 part 'src/db/models.dart';
 part 'src/db/model_db.dart';
 part 'src/db/model_db_impl.dart';
 
 const Symbol _dbKey = #_gcloud.db;
 
 /// Access the [DatastoreDB] object available in the current service scope.
 ///
 /// The returned object will be the one which was previously registered with
 /// [registerDbService] 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.
 DatastoreDB get dbService => ss.lookup(_dbKey);
 
 /// Registers the [DatastoreDB] object within the current service scope.
 ///
 /// The provided `db` object will be avilable via the top-level `db` 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 registerDbService(DatastoreDB db) {
   ss.register(_dbKey, db);
 }