Get rid of all the library tags.

lib/src/command/serve.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.command.serve;
-
 import 'dart:async';
 import 'dart:math' as math;
 
 import 'package:barback/barback.dart';
 
 import '../barback/asset_environment.dart';
 import '../log.dart' as log;
 import '../utils.dart';
 import 'barback.dart';
 
@@ skipping 158 matching lines @@
         "${padRight(server.rootDirectory, directoryLength)} "
         "on ${log.bold('http://$hostname:${server.port}')}");
   }
 
   /// Reports [error] and exits the server.
   void _fatalError(error, [stackTrace]) {
     if (_completer.isCompleted) return;
     _completer.completeError(error, stackTrace);
   }
 }