Tweaked custom Jackson serialization to make sure nested entities are rendered as resources so that links to related resources can be collected on nested levels as well.
Extracted EmbeddedResourcesAssembler from PersistentEntityResourceAssembler so that embedded resources can also be build for nested entities. Extracted a ResourceProcessorInvoker from ResourceProcessorHandlerMethodReturnValueHandler to allow ResourceSupport instances created for nested entities get the ResourceProcessor instance registered for them invoked as well.
ProjectionDefinitionRegistrar now also allows the domain type of a repository being registered as excerpt, too.
Related tickets: DATAREST-776.
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