Roll Observatory packages and add a roll script

packages/intl/lib/date_symbol_data_local.dart

 // Copyright (c) 2014, 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.
 
 /**
  * Date/time formatting symbols for all locales.
  *
  * DO NOT EDIT. This file is autogenerated by script.  See
@@ skipping 14136 matching lines @@
     'h:mm:ss a zzzz',
     'h:mm:ss a z',
     'h:mm:ss a',
     'h:mm a'
   ],
       DATETIMEFORMATS: const ['{1} {0}', '{1} {0}', '{1} {0}', '{1} {0}'],
       FIRSTDAYOFWEEK: 6,
       WEEKENDRANGE: const [5, 6],
       FIRSTWEEKCUTOFFDAY: 5)
 };