getLocationOnScreenOnceScrolledIntoView fix

Hi, thanks for sharing your awesome work!. This as temporary workaround for for https://code.google.com/p/selenium/issues/detail?id=6051 It's not really a fix as far as onScreen method is not yet implemented but at least we can run the code.

Something is broken about cookies due the update selenium-server "2.35.0" but I don't use it, I will try to look at it later

I am a newbie with Clojure yet so feel free to fix everything :)