Rendering added to cope with most forms.
iri creation now moved to tawny-owl.
New test added.
Whitespace on tests.
New methods for adding documentation.
IRI caching added.
Both some and only now broadcast.
Caching reworked. New single arity version for resolve-entity.
Reworked test method, as it seemed to be adding to the wrong namespace.
All entities can now be created using IRIs. These ignore the
iri-gen strategy for the current ontology, and are useful for
refering to external entities.