Get rid of all the library tags.

lib/src/barback/transformer_cache.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_cache;
-
 import 'package:path/path.dart' as p;
 
 import '../io.dart';
 import '../log.dart' as log;
 import '../package_graph.dart';
 import '../sdk.dart' as sdk;
 import '../utils.dart';
 import 'transformer_id.dart';
 
 /// A cache for managing a snapshot of the first "stage" of transformers to
@@ skipping 118 matching lines @@
       return new Set();
     }
 
     /// The second line of the manifest is a list of transformer ids used to
     /// create the existing snapshot.
     return manifest.single.split(",")
         .map((id) => new TransformerId.parse(id, null))
         .toSet();
   }
 }