Update pushstate.js ( Fix for firefox push/replacestate override problem...

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Hi I was using canjs with new pushstate functionality. All is working well in chrome / opera but not in firefox. The browser stopped listening to url changes all of the sudden after a couple of seconds of inactivity. The most bizzare situation which I am still not familiar with was when I changed any map property with attr the setState was called, otherwise not.

Anyway I deleted the push/replacestate override and call the setState in the click handler.