Handle it gracefully if JUnit is not on test classpath
Refactored: renamed classes
DriverRunner: toString to make debugging easier
JUnitCompatibilityDriver: walking skeleton
Load JUnitCompatibilityDriver using a ClassLoader that has JUnit on its classpath
Walking skeleton for JUnit compatibility; runs a single JUnit 3 test method
Marked DriverRunner as @ThreadSafe due to its toString being called from many threads by the actor message logger
Detecting JUnit 4 tests