fileFinder = function(root, cb) {
    fs.readdirSync(root).forEach(function(p) {
      if (/^\./.test(p)) {
        return;
      }
      var fullpath = path.join(root, p);
      var stat = fs.statSync(fullpath);
      if (stat.isFile()) {
        cb(fullpath);
      } else if (stat.isDirectory()) {
        fileFinder(fullpath, cb);
      }
    });
  }
Sweeps through the provided directory and calls the provided function
on each file.
@param {string} root The root of the directory.
@param {function(string)} cb The function to call for each file
    found under the directory.