Add gist5408860 package.

git-subtree-dir: gists/gist5408860
git-subtree-mainline: 318582d41a7d120ccdd9a52c85d67d5e563173a0
git-subtree-split: 186f9b2fc1fc21a0c17f8364e9b3b55ba9793b79
Add gist package descriptions, gofmt, other fixes.