Roll Observatory packages and add a roll script

charted/lib/locale/languages/en_us.dart

-//
-// Copyright 2014 Google Inc. All rights reserved.
-//
-// Use of this source code is governed by a BSD-style
-// license that can be found in the LICENSE file or at
-// https://developers.google.com/open-source/licenses/bsd
-//
-part of charted.locale;
-
-// Defines the en_us locale and related format properties.
-class EnUsLocale extends Locale {
-  static EnUsLocale instance;
-
-  factory EnUsLocale() {
-    if (EnUsLocale.instance == null) {
-      EnUsLocale.instance = new EnUsLocale._create();
-    }
-    return EnUsLocale.instance;
-  }
-
-  EnUsLocale._create();
-
-  final identifier = 'en_US';
-  final decimal = '.';
-  final thousands = ',';
-  final grouping = const[3];
-  final currency = const['\$', ''];
-  final dateTime = '%a %b %e %X %Y';
-  final date = '%m/%d/%Y';
-  final time = '%H =>%M =>%S';
-  final periods = const['AM', 'PM'];
-
-  final days = const[
-      'Sunday', 'Monday', 'Tuesday',
-      'Wednesday', 'Thursday', 'Friday', 'Saturday'];
-  final shortDays = const['Sun', 'Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat'];
-
-  final months = const[
-      'January', 'February', 'March', 'April', 'May', 'June',
-      'July', 'August', 'September', 'October', 'November', 'December'];
-  final shortMonths = const[
-      'Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul',
-      'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];
-}