Add library tag to number_format_test

pkg/i18n/test/number_format_test.dart

 /**
  * Copyright (c) 2012, 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('number_format_test');
+
 #import('../../../pkg/unittest/unittest.dart');
 #import('../number_format.dart');
 #import('../intl.dart');
 
 /**
  * Tests the Numeric formatting library in dart.
  */
 var testNumbers = const {
   "0.001":  0.001,
   "0.01": 0.01,
@@ skipping 21 matching lines @@
   });
 
   test('Simple set of numbers', () {
     var number = new NumberFormat();
     for (var x in testNumbers.getKeys()) {
       var formatted = number.format(testNumbers[x]);
       expect(formatted, x);
     }
   });
 }