Get rid of all the library tags.

lib/src/barback/load_all_transformers.dart

 // Copyright (c) 2013, 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 pub.load_all_transformers;
-
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 
 import '../log.dart' as log;
 import '../package_graph.dart';
 import '../utils.dart';
 import 'asset_environment.dart';
 import 'barback_server.dart';
 import 'dependency_computer.dart';
@@ skipping 143 matching lines @@
   var results = {};
   for (var package in graph.packages.values) {
     for (var phase in package.pubspec.transformers) {
       for (var config in phase) {
         results.putIfAbsent(config.id, () => new Set()).add(package.name);
       }
     }
   }
   return results;
 }