Get rid of all the library tags.

lib/src/help_command.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 args.help_command;
-
 import '../command_runner.dart';
 
 /// The built-in help command that's added to every [CommandRunner].
 ///
 /// This command displays help information for the various subcommands.
 class HelpCommand extends Command {
   final name = "help";
   String get description =>
       "Display help information for ${runner.executableName}.";
   String get invocation => "${runner.executableName} help [command]";
@@ skipping 27 matching lines @@
       }
 
       command = commands[name];
       commands = command.subcommands;
       commandString += " $name";
     }
 
     command.printUsage();
   }
 }