Release 0.2.3 (stripe#398)

* Setting version to 0.2.3

* update for 0.23 release

writeCSV (stripe#326)

update readme and version.sbt for 0.2.1 (stripe#325)

Merge pull request stripe#175 from stripe/minmax

Rectifier

Releasing 0.1.2

Update README.md

Releasing 0.1.0