Create a clean gh-pages branch.

gistfile1.sh

# delete any existing branch
git branch -D gh-pages
git push origin --delete gh-pages
# create new branch and switch to it
git checkout -b gh-pages
# remove all but git files
rm -rf $(ls -a | egrep -v '^(\.|\.\.|\.git)$')
# create an empty index.html and commit it
touch index.html
git add -A
git commit -m "Created clean gh-pages branch"
# push it, push it real good
git push -u origin gh-pages