Roll Observatory packages and add a roll script

packages/smoke/lib/src/implementation.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.
 
 /// A library that is used to select the default implementation of smoke. During
 /// development we use a default mirror-based implementation, for deployment we
 /// let the main program set programatically what implementation to use (likely
 /// one based on static code generation).
 library smoke.src.implementation;
 
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 /// Implementation of [SymbolConverterService] in use, initialized lazily so it
 /// can be replaced at deployment time with an efficient alternative.
 SymbolConverterService symbolConverter = new ReflectiveSymbolConverterService();
 
 throwNotConfiguredError() {
   throw new Exception('The "smoke" library has not been configured. '
       'Make sure you import and configure one of the implementations ('
       'package:smoke/mirrors.dart or package:smoke/static.dart).');
 }