Add gist6724654 package.
Add gist6724654 package.

git-subtree-dir: gists/gist6724654
git-subtree-mainline: 0cc34b9c4ff4b3793ef001c8c391e27c33f6c57d
git-subtree-split: 8c5d26fcf15122d6dcdae8e841908450531eec08

shurcooL/go