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.
Cherry picked two commits from 2.1.x branch, one for Mike Pilquist's OSGI
test fix and the other the new browser tags for selenium tests.

Added tags for browsers for tests that use Selenium.

Conflicts:

	build.xml