Update SPARQLHTML serializer to consume AbbreviatingSerializer

[kasei]

Emit prefix names as the link text for IRIs.

After consuming Attean::API::AbbreviatingSerializer, the serializer will have a namespaces attribute. When serializing IRIs as links, check to see if the IRI can be shortened to a prefixname based on the URI prefixes in the namespaces (URI::NamespaceMap) object. The Turtle serializer has code that shortens IRIs to prefixnames that can be used as a guide for how to do it.

In the end, you should end up with an HTML link for IRIs that (assuming the right prefixes are defined) looks something like:

<a href="http://xmlns.com/foaf/0.1/Person">foaf:Person</a>

The only code that needs to change is in AtteanX::Serializer::SPARQLHTML::node_as_html. Following the Turtle serializer code, this should be a very simple task.