HEAD requests should not echo the response

[logistiker]

Although I could set the body to null for head requests, I think this should really be handled by tonic. The echo should not even be called for a HEAD request.

/**
 * Output the response
 * @codeCoverageIgnore
 */
function output() {

    if (php_sapi_name() != 'cli' && !headers_sent()) {

        header('HTTP/1.1 '.$this->code);
        foreach ($this->headers as $header => $value) {
            header($header.': '.$value);
        }
    }
    if (strtoupper($this->request->method) !== 'HEAD') {
        echo $this->body;
    }

}

[peej]

Although it adds a special case for a single method, HEAD is a special case so I don't see this as a problem. Thanks.