Add FeatureSpec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add FreeSpec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add FunSpec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add PropSpec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add ScalaTest introductory example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add Spec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add WordSpec example from scalatest.org

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>
Add support for ScalaTest to exemplar

Signed-off-by: George K. Thiruvathukal <gkt@cs.luc.edu>