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
Add support for regression bootstrapping
Bump version to 0.13.2.0
Add splitGen
Use splitGen in another place
Add some error checking to bootstrapRegress
Added tag 0.13.2.0 for changeset 74572dc84875
Bump dependency on vector
Bump version to 0.13.2.1
Added tag 0.13.2.1 for changeset b4307c598670