Minor bugs

Hi,
i have found some bugs:
Wrong protocol detected on attach url. https://plugins.trac.wordpress.org/browser/tcs3/tags/1.1/tcS3.php#L511 should be

$protocol = (!empty($_SERVER['HTTPS']) && $_SERVER['HTTPS'] != 'off') ? "https" : "http";

Missing check for memcached settings https://plugins.trac.wordpress.org/browser/tcs3/tags/1.1/tcS3.php#L326
Above could be added:

$memcacheHosts = $this->options["s3_redirect_cache_memcached"];
        if(empty($memcacheHosts)){
            return false;
        }

Thanks for the nice plugin.

https://wordpress.org/plugins/tcs3/