Add [hidden] style and improve readme

Hi Alexander!

I think it's a good idea to include missed [hidden] style into IE<10 and also is it a typo in readme on the 32th line? Because IE9 doesn't have correct styles for some new html5 element, so the script should execute for this browser. IE10 skips conditional comments so I left just __if IE__ as a condition which makes it simpler.

Thanks,
Maksim Chemerisuk