Roll Observatory packages and add a roll script

intl/lib/date_symbol_data_http_request.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 via http requests to a web server..
- */
-library date_symbol_data_http_request;
-
-import 'dart:async';
-
-import 'date_symbols.dart';
-import 'intl.dart';
-import 'src/data/dates/locale_list.dart';
-import 'src/date_format_internal.dart';
-import 'src/http_request_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 [url].
- * The [url] parameter should end with a "/". For example,
- *   "http://localhost:8000/dates/"
- */
-Future initializeDateFormatting(String locale, String url) {
-  var reader = new HttpRequestDataReader('${url}symbols/');
-  initializeDateSymbols(() => new LazyLocaleData(
-      reader, _createDateSymbol, availableLocalesForDateFormatting));
-  var reader2 = new HttpRequestDataReader('${url}patterns/');
-  initializeDatePatterns(() =>
-      new LazyLocaleData(reader2, (x) => x, availableLocalesForDateFormatting));
-  var actualLocale = Intl.verifiedLocale(
-      locale, (l) => availableLocalesForDateFormatting.contains(l));
-  return initializeIndividualLocaleDateFormatting((symbols, patterns) {
-    return Future.wait(
-        [symbols.initLocale(actualLocale), patterns.initLocale(actualLocale)]);
-  });
-}
-
-/** Defines how new date symbol entries are created. */
-DateSymbols _createDateSymbol(Map map) =>
-    new DateSymbols.deserializeFromMap(map);