Get rid of all the library tags.

lib/src/scanner.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.scanner;
-
 import 'package:collection/collection.dart';
 import 'package:string_scanner/string_scanner.dart';
 import 'package:source_span/source_span.dart';
 
 import 'style.dart';
 import 'token.dart';
 import 'utils.dart';
 import 'yaml_exception.dart';
 
 /// A scanner that reads a string of Unicode characters and emits [Token]s.
@@ skipping 1658 matching lines @@
 
   /// All trailing whitespace is preserved.
   static const KEEP = const _Chomping("KEEP");
 
   final String name;
 
   const _Chomping(this.name);
 
   String toString() => name;
 }