Support for rendering ontologies.

A convienience function to render either an OWL API ontology object,
or an IRI to tawny forms.
Can now render to multiple forms. Core.logic for query.

Previously, render could only produce an "evalable" form. Now it can also
produce a clojure data structure form which is better for querying. At the
same time all dynamic vars have been removed, which makes laziness possible
(or at least no longer a problem). Most of the implementation has been made
private. Query has been updated to reflect, and some logic goals have been
added.
Bit clean up of todo!