Made including skew in the estimated response time optional.
Made including skew in the estimated response time optional.

We've learned that using extra-large EC2 instances removes the
clock skew problem, meaning that (as long as we keep using those
instances) including clock skew in response time does more harm
than good.

radlab/sparrow,radlab/sparrow,dmwu/sparrow,YanjieGao/sparrow,dmwu/sparrow,radlab/sparrow,dmwu/sparrow,radlab/sparrow,YanjieGao/sparrow,dmwu/sparrow,YanjieGao/sparrow