Restructure the yaml package.

Review URL: https://codereview.chromium.org//14103026

git-svn-id: https://dart.googlecode.com/svn/branches/bleeding_edge/dart/pkg/yaml@21571 260f80e4-7a28-3924-810f-c04153c831b5
11 files changed
tree: 723c20b6f82512a3e6583e354c7f65fbcf2fc150
  1. pkgs/