BUGFIX: Replacing the '\' with '/' in methods XByName

Bug fixed: on a Windows server the php function dirname has returned a '\' if using
the root directory in the FTP-Configuration. This caused that the string '/\' was delivered
to ftp_rawlist as directory name. So no FTP-Operatons were possible in the root directory.

	modified:   lib/Touki/FTP/Manager/FTPFilesystemManager.php