git checkout HEAD path/to/file.txt
git checkout [commit revision] [file name]
http://stackoverflow.com/questions/2733873/reverting-a-single-file-to-a-previous-version-in-git
git checkout HEAD path/to/file.txt
git checkout [commit revision] [file name]
http://stackoverflow.com/questions/2733873/reverting-a-single-file-to-a-previous-version-in-git