Fix a  nasty index-out-of-bounds bug

The zeroth quantile of the normal distribution is defined to be
-infinity, leading to a huge negative vector index being generated
if none of the resampled values are less than the sample mean.

This fixes bos/criterion#52.
Bump version to 0.13.1.1
Added tag 0.13.1.1 for changeset 2eed7bb5d817