Add proxy_max_temp_file_size

Adding "proxy_max_temp_file_size 0;" Following the request of a member of the mailing list

conf/nginx_captive-piratebox.conf

@@ -43,6 +43,7 @@ server {
     client_body_temp_path /var/spool/piratebox/;
     fastcgi_pass_request_body off;
     client_body_in_file_only clean;
+    proxy_max_temp_file_size 0;
     fastcgi_param REQUEST_BODY_FILE $request_body_file;
 
     fastcgi_read_timeout 600;