Fix OSGi tests

Due to recent changes/additions in ScalaTest macros, the
scala.reflect.runtime package is now required, which is provided by the
scala-compiler JAR. The OSGi tests did not include this JAR and hence
bundle resolution of scalatest would fail. Also bumped versions of
pax-exam and related libs.
Merge branch 'fix-osgi-tests' of https://github.com/mpilquist/scalatest into 2.1.x