Re-land r29957 (add versions and constraints for packages and samples), with
SDK constraints bumped from 1.0.0 to 0.8.10+6 .

R=ricow@google.com, sigmund@google.com

Review URL: https://codereview.chromium.org//62473002

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@29986 260f80e4-7a28-3924-810f-c04153c831b5

pkgs/yaml/pubspec.yaml

diff --git a/pkgs/yaml/pubspec.yaml b/pkgs/yaml/pubspec.yaml
index 4b17267..1fb4c8d 100644
--- a/pkgs/yaml/pubspec.yaml
+++ b/pkgs/yaml/pubspec.yaml
@@ -1,6 +1,9 @@
 name: yaml
+version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: A parser for YAML.
 dev_dependencies:
-  unittest: any
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=0.8.10+6 <2.0.0"