Get rid of all the library tags.

test/string_scanner_test.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 string_scanner.string_scanner_test;
-
 import 'package:string_scanner/string_scanner.dart';
 import 'package:test/test.dart';
 
 void main() {
   group('with an empty string', () {
     var scanner;
     setUp(() {
       scanner = new StringScanner('');
     });
 
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       expect(() => new StringScanner('foo bar', position: -1),
           throwsArgumentError);
     });
 
     test('throws an ArgumentError if the position is beyond the string', () {
       expect(
           () => new StringScanner('foo bar', position: 8), throwsArgumentError);
     });
   });
 }