IE fixes and game serialization

Fixed a few IE specific issues:
 - CSS for IE
 - Pointer events for touch in IE (now that no longer using hammer)
 - Try Again button wouldn't dismiss in IE after clicking the button due to IE classList.remove only taking a single class name per method call

I also save and restore the game state when closing and opening the page. This is useful on my phone's browser where the phone can shutdown the browser process when its in the background but I want to come back to my game in progress.

Awesome game BTW! =)