Get rid of all the library tags.

lib/src/command/barback.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.barback;
-
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
 
 import '../command.dart';
 import '../io.dart';
 import '../log.dart' as log;
 import '../utils.dart';
 
@@ skipping 172 matching lines @@
     var verb = pluralize(singularVerb, directoryNames.length,
         plural: pluralVerb);
 
     var result = "$directories $names $verb";
     if (suffix != null) result += " $suffix";
     result += ".";
 
     return result;
   }
 }