Get rid of all the library tags.

lib/src/barback/transformer_loader.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 pub.barback.transformer_loader;
-
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 
 import '../log.dart' as log;
 import '../utils.dart';
 import 'asset_environment.dart';
 import 'barback_server.dart';
 import 'dart2js_transformer.dart';
 import 'excluding_transformer.dart';
@@ skipping 101 matching lines @@
       Iterable<Set<TransformerConfig>> phases) async {
     var result = await Future.wait(phases.map((phase) async {
       var transformers = await waitAndPrintErrors(phase.map(transformersFor));
       return unionAll(transformers);
     }));
 
     // Return a growable list so that callers can add phases.
     return result.toList();
   }
 }