Uglify Scala sources.
sbt 0.13.x / 1.0.x
echo 'addSbtPlugin("com.mayreh" % "sbt-uglifier" % "1.0")' >> project/plugins.sbt!!!! IMPORTANT !!!! sbt-uglifier deletes all original sources without backup. Use VCS.
$ cd /path/to/your-sbt-project
$ sbt uglify