add versions and constraints for packages and samples

- all packages at 0.9.0, except "analyzer" which had a version already
- dependencies at ">=0.9.0 <0.10.0" except analyzer is ">=0.10.0 <0.11.0"
- sdk constraint ">=1.0.0 <2.0.0"

R=sigmund@google.com

Review URL: https://codereview.chromium.org//59763006

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/http@29957 260f80e4-7a28-3924-810f-c04153c831b5
diff --git a/pubspec.yaml b/pubspec.yaml
index 515206d..2a3b665 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,8 +1,11 @@
 name: http
+version: 0.9.0
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: A composable, Future-based API for making HTTP requests.
 dependencies:
-  path: any
+  path: ">=0.9.0 <0.10.0"
 dev_dependencies:
-  unittest: any
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=1.0.0 <2.0.0"