Change the http version from 1.0 to 1.1 in PHP

Without this, on one of my setup, upgrading from Apache 2.2 to Apache 2.4 would make the request for the JS asset hang.

src/php/Genghis/Response.php

@@ -50,7 +50,7 @@ public static function getStatusText($status)
 
     protected function renderHeaders()
     {
-        header(sprintf('HTTP/1.0 %s %s', $this->status, self::$statusCodes[$this->status]));
+        header(sprintf('HTTP/1.1 %s %s', $this->status, self::$statusCodes[$this->status]));
         foreach ($this->headers as $name => $val) {
             header(sprintf('%s: %s', $name, $val));
         }