code: function purgeEmptyParentFolders(rootPath, subfolderPath, logger, cb) {
  	var fullPath = path.join(rootPath, subfolderPath);
  
  	// Don't delete if we have reached the base
  	if (!subfolderPath || subfolderPath === '.') {
  		return cb();
  	}
  
  	fs.rmdir(fullPath, function (error) {
  		if (error) {
  			return cb(error);
  		}
  
  		logger.verbose('Purged empty subfolder:', fullPath);
  
  		return purgeEmptyParentFolders(rootPath, path.dirname(subfolderPath), logger, cb);
  	});
  }
docs: Recursively purges empty folders from subfolderPath and working its way through its parents until
  reaching rootPath.
  
  @param {String} rootPath - root path to which the given subfolder belongs
  @param {String} subfolderPath - subfolder path relative to the root path
  @param {Object} logger
  @param {Function} cb