FAKEHBASE-25. scala dependency should be bumped to 2.9.3 from 2.9.2

 - Override scala version to 2.9.3 until POM-23 is completed.
 - Require update scalatest to 1.9.2

issue: https://jira.kiji.org/browse/FAKEHBASE-25
review: https://review.kiji.org/r/1211