Get rid of all the library tags.

lib/src/equality.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.equality;
-
 import 'dart:collection';
 
 import 'package:collection/collection.dart';
 
 import 'yaml_node.dart';
 
 /// Returns a [Map] that compares its keys based on [deepEquals].
 Map deepEqualsMap() => new HashMap(equals: deepEquals, hashCode: deepHashCode);
 
 /// Returns whether two objects are structurally equivalent.
@@ skipping 100 matching lines @@
       } else {
         return value.hashCode;
       }
     } finally {
       parents.removeLast();
     }
   }
 
   return _deepHashCode(obj);
 }