Added pruning support in dir->recurse(). If recurse callback
returns $item->PRUNE, no children of this item will be
analyzed. [Marcin Kasperski]Documented 'basename' method for directories. [Fabrice Gabolde]
Added traverse_if() function, which allows one to filter children
before processing them. [Marcin Kasperski]Added tempdir() function. [cho45]