Update to 0.27
    
    - New upstream release 0.27:
      - Added pruning support in dir->recurse(); if recurse callback returns
        $item->PRUNE, no children of this item will be analyzed
      - Documented 'basename' method for directories
      - Added traverse_if() function, which allows one to filter children before
        processing them
      - Added tempdir() function
    - Package upstream LICENSE file