Support strict/full/all for definedBy. Fixes #105.

[sa-bpelakh]

• Add a full mode to replace what the old all mode used to do (add rdfs:isDefinedBy to any entity that has attributes in addition to rdf:type)
• Modify all to annotate any entity that has a type, even if it's the only attribute.
• Add a mode attribute to the bundle definedBy action so that the full functionality is available from bundles.

Address #105 and enable https://github.com/semanticarts/gist/issues/775.

Since this modifies the behavior of the command-line interface, it would require a major release. Will probably hold until we can fold in a few other interface-breaking or substantial changes.

[sa-bpelakh]

Rescoping the work as follows as per discussion with @rjyounes :

1. strict get modified to any ontology concepts (e.g. classes, properties, etc) as well as any instances of classes declared in the ontology, removing owl:Thing as it is no longer needed
2. all will remain as is - any entity that has properties other than type