replace missing pizza with inlined koala
Updated old pizza url, fixes issue 347 on sourceforge
Fixes #46 Round tripping error in functional syntax

Some axioms that violate OWL specs can be written out in functional
syntax but cannot be parsed back in.
Added tests in the functional syntax renderer to skip these axioms,
so the output can be roundtripped.
Fixes #41 Parsing error Informed Consent Permission Ontology

A null pointer exception caused by a missing IRI in input which is not
detected early enough. Added check at SWRL atom translation level.
Added test for rdf:description violation