Unit testing works.

* Put test classes into src/test/scala

* Added ScalaTest dependency to build.sbt in project directory.

* Added resolvers += "SonaType" at "https://oss.sonatype.org/content/groups/public" to ~/.sbt/0.13/global.sbt

* Would be better to add this to some project-specific path so that it is version-controlled.
  Need to figure this out