Move the Java JUnit bootstrap class that run the Scala tests into Scala

This is often does not compile when imported into the IDE and should be easy to fix.

Some ideas from Google:

http://www.scalatest.org/user_guide/using_junit_runner
http://alvinalexander.com/scala/how-to-use-junit-testing-with-scala
http://stackoverflow.com/questions/4546169/how-to-run-scala-tests-with-junit-4
http://www.scalatest.org/getting_started_with_junit_4_in_scala
