Rename the _fletch_system and service and dart: libraries

samples/buildbot/dart/buildbot_service.dart

 // Copyright (c) 2015, the Fletch 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.md file.
 
 // Generated file. Do not edit.
 
 library buildbot_service;
 
 import "dart:fletch";
 import "dart:fletch.ffi";
-import "dart:service" as service;
+import "dart:fletch.service" as service;
 import "struct.dart";
 
 final Channel _channel = new Channel();
 final Port _port = new Port(_channel);
 final ForeignFunction _postResult = ForeignLibrary.main.lookup("PostResultToService");
 
 bool _terminated = false;
 BuildBotService _impl;
 
 abstract class BuildBotService {
@@ skipping 369 matching lines @@
   CommitListUpdatePatchDataBuilder operator[](int index) => readListElement(new CommitListUpdatePatchDataBuilder(), index, 16);
 }
 
 class _CommitPatchDataList extends ListReader<CommitPatchData> implements List<CommitPatchData> {
   CommitPatchData operator[](int index) => readListElement(new CommitPatchData(), index, 24);
 }
 
 class _CommitPatchDataBuilderList extends ListBuilder<CommitPatchDataBuilder> implements List<CommitPatchDataBuilder> {
   CommitPatchDataBuilder operator[](int index) => readListElement(new CommitPatchDataBuilder(), index, 24);
 }