Fixes to TutorialSnippets Test:

 Load Pizza Ontology from local file using an Auto IRI Mapper set via finding Resource via ClassLoader.

 Avoid writing to console by creating simple LoggingReasonerProgressMonitor (which might be a sensible class
 outside the test framework).

 Add a few not-null assertions in otherwise empty loops.

 In testMergedOntology, create an example, non-empty ontology to allow so that merge runs and existing axioms pass.