Get rid of all the library tags.

lib/src/command/cache_add.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.command.cache_add;
-
 import 'dart:async';
 
 import 'package:pub_semver/pub_semver.dart';
 
 import '../command.dart';
 import '../log.dart' as log;
 import '../source/hosted.dart';
 import '../utils.dart';
 
 /// Handles the `cache add` pub command.
@@ skipping 67 matching lines @@
       // Install them in ascending order.
       ids.sort((id1, id2) => id1.version.compareTo(id2.version));
       await Future.forEach(ids, downloadVersion);
     } else {
       // Pick the best matching version.
       ids.sort((id1, id2) => Version.prioritize(id1.version, id2.version));
       await downloadVersion(ids.last);
     }
   }
 }