Merge branch 'sbt-0.13', remote-tracking branch 'origin'
Merge remote-tracking branch 'origin/sbt-0.13'
Added a single 'nothing' test to this project.
Started on test for thread-safe implementation of test listener.
Started to make thread listener thread safe. Need to now switch to a concurrent map.
Abstracted report directory management, and moved test report location to ./target. Also added synchronization to group start.
Merge pull request #8 from mmarich/thread-safe-listener

Thread safe listener