Re: [uievents] Expose 'direction-inversion' in wheel events (#57)

I agree this is worth doing and should be relatively straight forward.  We'd probably implement this in blink if other vendors were interested too.  One scenario where this can be really valuable is when using `wheel` events to drag an element around the screen.  When I built [this demo](http://output.jsbin.com/qiyaseza/1) for that, I had to provide an option for the user to invert the vertical direction.

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