Roll Observatory packages and add a roll script

intl/lib/date_symbol_data_file.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 file should be imported, along with date_format.dart in order to read
- * locale data from files in the file system.
- */
-
-library date_symbol_data_file;
-
-import 'dart:async';
-
-import 'package:path/path.dart' as path;
-
-import 'date_symbols.dart';
-import 'src/data/dates/locale_list.dart';
-import 'src/date_format_internal.dart';
-import 'src/file_data_reader.dart';
-import 'src/lazy_locale_data.dart';
-
-export 'src/data/dates/locale_list.dart';
-
-/**
- * This should be called for at least one [locale] before any date formatting
- * methods are called. It sets up the lookup for date symbols using [path].
- * The [path] parameter should end with a directory separator appropriate
- * for the platform.
- */
-Future initializeDateFormatting(String locale, String filePath) {
-  var reader = new FileDataReader(path.join(filePath, 'symbols'));
-  initializeDateSymbols(() => new LazyLocaleData(
-      reader, _createDateSymbol, availableLocalesForDateFormatting));
-  var reader2 = new FileDataReader(path.join(filePath, 'patterns'));
-  initializeDatePatterns(() =>
-      new LazyLocaleData(reader2, (x) => x, availableLocalesForDateFormatting));
-  return initializeIndividualLocaleDateFormatting((symbols, patterns) {
-    return Future
-        .wait([symbols.initLocale(locale), patterns.initLocale(locale)]);
-  });
-}
-
-/** Defines how new date symbol entries are created. */
-DateSymbols _createDateSymbol(Map map) =>
-    new DateSymbols.deserializeFromMap(map);