Get rid of all the library tags.

lib/src/executable.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.executable;
-
 import 'dart:async';
 import 'dart:io';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as p;
 
 import 'barback/asset_environment.dart';
 import 'entrypoint.dart';
 import 'exit_codes.dart' as exit_codes;
 import 'io.dart';
@@ skipping 270 matching lines @@
 Future<int> _runCachedExecutable(Entrypoint entrypoint, String snapshotPath,
     List<String> args, {bool checked: false}) {
   return runSnapshot(snapshotPath, args,
       packagesFile: entrypoint.packagesFile,
       checked: checked,
       recompile: () {
     log.fine("Precompiled executable is out of date.");
     return entrypoint.precompileExecutables();
   });
 }