add HTML5 progress bar

When form has a page_break(s) , showing a pregress bar is more user friendly.
I assume your browser supports HTML5. 

![form1](https://f.cloud.github.com/assets/531277/253367/f89179d6-8bce-11e2-8a0e-5ba63b3980ad.png)
![form2](https://f.cloud.github.com/assets/531277/253368/fcf64a42-8bce-11e2-89b6-88b8cb601a48.png)

Maybe here is not the best place to put on <progress> tag.