provide isolated child classloader to address issue:
aspectj tests are not runnable due to wrong classloader setup #42
Conflicts:
	org.scala-ide.sdt.scalatest/src/scala/tools/eclipse/scalatest/launching/ScalaTestLauncher.scala

Conflicts:
	org.scala-ide.sdt.scalatest/src/scala/tools/eclipse/scalatest/launching/ScalaTestLauncher.scala