Also release yaml 1.0.0.

R=efortuna@google.com, rnystrom@google.com, sigmund@google.com

Review URL: https://codereview.chromium.org//302313007

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge@36937 260f80e4-7a28-3924-810f-c04153c831b5