Re-land r29957 (add versions and constraints for packages and samples), with

pkg/analyzer/pubspec.yaml

Index: pkg/analyzer/pubspec.yaml
===================================================================
--- pkg/analyzer/pubspec.yaml	(revision 29983)
+++ pkg/analyzer/pubspec.yaml	(working copy)
@@ -1,11 +1,13 @@
 name: analyzer
-version: 0.10.0
+version: 0.10.1
 author: Dart Team <misc@dartlang.org>
 description: Static analyzer for Dart.
 homepage: http://www.dartlang.org
 dependencies:
-  args: ">=0.8.9 <1.0.0"
-  logging: ">=0.8.9 <1.0.0"
-  path: ">=0.8.9 <1.0.0"
+  args: ">=0.9.0 <0.10.0"
+  logging: ">=0.9.0 <0.10.0"
+  path: ">=0.9.0 <0.10.0"
 dev_dependencies:
-  unittest: ">=0.8.9 <1.0.0"
+  unittest: ">=0.9.0 <0.10.0"
+environment:
+  sdk: ">=0.8.10+6 <2.0.0"