Roll Observatory packages and add a roll script

smoke/pubspec.yaml

-name: smoke
-version: 0.3.5
-author: Polymer.dart Authors <web-ui-dev@dartlang.org>
-homepage: https://github.com/dart-lang/smoke
-description: >
-  A restricted reflective system that uses mirrors at development time, but that
-  can be replaced with non-reflective calls using code generation. See README.md
-  for mode details.
-dependencies:
-  barback: ">=0.9.0 <0.16.0"
-  logging: ">=0.9.0 <0.12.0"
-  analyzer: ">=0.13.0 <0.27.0"
-# TODO(sigmund): once we have some easier way to do global app-level
-# transformers, we might want to remove this transformer here and only apply it
-# in apps that need it.
-transformers:
-- smoke/src/default_transformer:
-    $include: lib/src/implementation.dart
-dev_dependencies:
-  unittest: ">=0.10.0 <0.12.0"
-  path: ">=1.0.0 <2.0.0"
-  code_transformers: ">=0.2.0 <0.3.0"
-environment:
-  sdk: ">=1.3.0-dev.7.9 <2.0.0"