Get rid of all the library tags.

lib/src/loader.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 yaml.loader;
-
 import 'package:charcode/ascii.dart';
 import 'package:source_span/source_span.dart';
 
 import 'equality.dart';
 import 'event.dart';
 import 'parser.dart';
 import 'yaml_document.dart';
 import 'yaml_exception.dart';
 import 'yaml_node.dart';
 
@@ skipping 333 matching lines @@
         case ".nan":
         case ".NaN":
         case ".NAN":
           return double.NAN;
       }
     }
 
     return null;
   }
 }