Change intl to use new pub layout

pkg/intl/lib/file_data_reader.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.
-
-/**
- * This contains a reader that accesses data from local files, so it can't
- * be run in the browser.
- */
-
-#library('file_data_reader');
-
-#import('dart:io');
-#import('intl_helpers.dart');
-
-class FileDataReader implements LocaleDataReader {
-
-  /// The base path from which we will read data.
-  String path;
-
-  FileDataReader(this.path);
-
-  /// Read the locale data found for [locale] on our [path].
-  Future read(String locale) {
-    var file = new File('$path$locale.json');
-    return file.readAsText();
-  }
-}