Add support for expected exceptions

• Create AtomicTest object prior to execution of first "particle" method, storing it in a map keyed with the associated runner.
• Add methods:
  • LifecycleHooks.getAtomicTestOf(Object)
  • RunAnnouncer.newAtomicTest(Description)
  • RunAnnouncer.getAtomicTestOf(Object)
  • RunAnnouncer.setTestFailure(Failure)
• Update RunAnnouncer listener methods to create and use a single AtomicTest object for the entire run of each "atomic" test.