Roll Observatory packages and add a roll script

packages/intl/lib/date_symbols.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.
 library date_symbols;
 
 /**
  * This holds onto information about how a particular locale formats dates. It
  * contains mostly strings, e.g. what the names of months or weekdays are,
  * but also indicates things like the first day of the week. We expect the data
  * for instances of these to be generated out of ICU or a similar reference
@@ skipping 284 matching lines @@
   'jmz': 'h:mm a z', // HOUR_MINUTETZ
   'jz': 'h a z', // HOURGENERIC_TZ
   'm': 'm', // MINUTE
   'ms': 'mm:ss', // MINUTE_SECOND
   's': 's', // SECOND
   'v': 'v', // ABBR_GENERIC_TZ
   'z': 'z', // ABBR_SPECIFIC_TZ
   'zzzz': 'zzzz', // SPECIFIC_TZ
   'ZZZZ': 'ZZZZ' // ABBR_UTC_TZ
 };