Add CapabilityRegistryEvent.Ready and fire this after bootstrap has loaded the registry.
Changed all booter support to use this event and become EventSubscribers and not @EagerSingletons.
Make EventSubscriberHost a LifecycleSupport sub-class and use start/stop.
Avoid pre-emptive string creation for logging.
fix sp
Restore firing of AfterLoad event, was changed to Ready by mistake
Merge pull request #604 from sonatype/capability-registry-ready

REVIEW: Capability registry ready event