Updated for sbt 0.13.0. Incremented version to 0.3

Updated with regard to sbt 0.13.0 api changes, specifically due to TestEvent.detail now returning an sbt.testing.event. TestResult does not have a skipped value type, so I have removed the logic entirely. Only part I have not tried out are the throwables.

Some potentially handy links if you are going to review this:

https://groups.google.com/forum/#!topic/simple-build-tool/wcSNldF3UDI
http://www.scala-sbt.org/release/api/index.html#sbt.TestEvent

Should resolve #2