Feature: overriding download mode

[hm122]

Hi!

With Ubuntu Server I'm getting an error for downloading files in ascii mode (550 SIZE). It would be awesome to be able to override the mode with the download function, e.g. something like this:

public function downloadFile($fileFrom, $fileTo, $mode=null)
    {
        $fileInfos = explode('.', $fileFrom);
        $extension = end($fileInfos);
        if($mode == null) {
           $mode = $this->findTransferModeForExtension($extension);
       }
        try {
            if (ftp_get($this->connectionId, $fileTo, $fileFrom, $mode, 0))
                return true;
            else
                return false;
        } catch(\Exception $e) {
            return false;
        }
    }