Add OWLObjectProperty to import. Remove fully qualified name elsewhere.
Added refine multimethod and defrefine macro.

Refine allows the addition of new frames to an existing OWLObject, and adds
this to the current ontology. defrefine also adds this object as the value of
a var in the current namespace. Useful for building ontologies with two
expressivities.
Use defonce for vars which store state across clojure.

These vars store ontologies in all namespaces. Evaling all of
owl.clj wiped this out which was painful.
Added defontfn and applied it.

Generalises the case of a function which can take an ontology as
the first argument, or can use the current-ontology.
iri-create added

A convienience method which makes writing imports easier.