Keeping gh pages fresh

As per github requirements, the project's web site is on the gh-pages branch. One issue we have is that the CardsJS.css and CardsJS.min are needed by the web site and thus must be in two branches. How do we keep the gh-pages branch in-sync with master?

As Nicolas Gallagher has blogged, we can use git checkout to copy a file from one branch to another.

# Assuming current branch is gh-pages
git checkout master -- cardjs.css
git checkout master -- cardjs.js
git commit -m "Update cardjs from master"