Update Jo Online Demo code

[ngduc]

Hi,
Jo framework's demo has been listed on http://frameworkdemos.com
It's a free service to list all popular frameworks' demos so that users can try them on their mobile devices without looking for links around the internet.

Could you verify it and if possible, update Jo's demo source code at:
https://github.com/ngduc/framework-demos

Please let me know if there is any problem with my setup. Thanks.
Regards,
Duc