Memory leak in RepositoryComponents singleton

RepositoryComponentsFactory has a static singleton member of type RepositoryComponents.

Repository classes are added to this singleton, but are never deleted.

This will cause a classloader leak when the DeltaSpike modules live longer than application modules, e.g. in OSGi when each DeltaSpike module is a separate bundle, or in WildFly when DeltaSpike is installed as a JBoss module.