$ git clone <repo> -b gh-pages

$ cd repository

$ git checkout --orphan gh-pages
# Creates our branch, without any parents (it's an orphan!)
# Switched to a new branch 'gh-pages'

$ git rm -rf .
# Remove all files from the old working tree
# rm '.gitignore'

$ git config user.name 'Hatter Jiang'
$ git config user.email 'jht5945@gmail.com'

$ echo "My GitHub Page" > index.html
$ git add index.html
$ git commit -a -m "First pages commit"
$ git push origin gh-pages

$ git branch --set-upstream-to=origin/gh-pages

Setting up a custom domain with GitHub Pages

http://githubrank.com/

http://jlord.github.io/git-it/

参考资料

[1]. https://help.github.com/articles/creating-project-pages-manually
[2]. https://help.github.com/articles/setting-up-a-custom-domain-with-pages