upgrade to sbt 0.13.2-RC1
Merge branch 'headless' into sbt-0.13.2
upgrade to sbt 0.13.2-RC2
Merge branch 'headless' into sbt-0.13.2
upgrade to sbt 0.13.2-RC3
Merge remote-tracking branch 'origin/headless' into sbt-0.13.2
upgrade to sbt 0.13.2
Merge pull request #591 from NetLogo/sbt-0.13.2

upgrade to sbt 0.13.2