Update src/ZFTool/Controller/InstallController.php

to make "zf.php install zf anydir" working with php5.3.*

the line 58:
$zipFolder = $tmpDir . '/' . rtrim($zip->statIndex(0)['name'], "/");

have been replaced by :
$zipFolders = $zip->statIndex(0);
$zipFolder = $tmpDir . '/' . rtrim($zipFolders['name'], "/");