Moved pkg pubspecs to use dev_dependencies where appropriate

BUG=https://code.google.com/p/dart/issues/detail?id=9309

Review URL: https://codereview.chromium.org//12962003

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@20285 260f80e4-7a28-3924-810f-c04153c831b5

pkgs/yaml/pubspec.yaml

diff --git a/pkgs/yaml/pubspec.yaml b/pkgs/yaml/pubspec.yaml
index 7c944d2..4b17267 100644
--- a/pkgs/yaml/pubspec.yaml
+++ b/pkgs/yaml/pubspec.yaml
@@ -2,6 +2,5 @@
 author: "Dart Team <misc@dartlang.org>"
 homepage: http://www.dartlang.org
 description: A parser for YAML.
-dependencies:
-  unittest:
-    sdk: unittest
+dev_dependencies:
+  unittest: any