Change file permissions to 664, directory permissions to 775
// Run this from the command line.
// h/t: http://superuser.com/questions/91935/how-to-chmod-755-all-directories-but-no-file-recursively#answer-91966
// add read/execute to world, remove write
chmod -R u+rwX,g+rwX,o+rX-w path/
// remove read/write/execute from world
chmod -R u+rwX,g+rwX,o-rwX path/