Sends a file via FTP.

def _send_file(self, filename):
        """
        Sends a file via FTP.
        """
        # pylint: disable=E1101
        ftp = ftplib.FTP(host=self.host)
        ftp.login(user=self.user, passwd=self.password)
        ftp.set_pasv(True)
        ftp.storbinary("STOR %s" % os.path.basename(filename),
            file(filename, 'rb'))