Get rid of all the library tags.

lib/src/command/build.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.build;
-
 import 'dart:async';
 
 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;
 
 import '../barback/asset_environment.dart';
 import '../exit_codes.dart' as exit_codes;
 import '../io.dart';
 import '../log.dart' as log;
 import '../utils.dart';
@@ skipping 242 matching lines @@
         "end": {
           "line": entry.span.end.line,
           "column": entry.span.end.column
         },
       };
     }
 
     return data;
   }
 }