Finish 0.0.1
Calculate subClass only over the base vocabulary, and those vocabularies which import it. (`RDF::Vocabulary.imported_from`).
Be more forgiving if asking to entail something that's not the right vocabulary term.
Update specs due to correction in RDF.rb vocab defs.
Ignore rdfs:Resource in range.
Add support for Role class in domain_includes/range_includes.

* If `resource` is of type `schema:Role`, `resource` is in acceptable if any other resource references `resource` using this property.

* If `resource` is of type `schema:Role`, it is range acceptable if it has the same property with an acceptable value.
Added ISO 8601 regular expression matcher for schema:Date.
Version 0.0.2.
Release 0.0.2.
* Calculate subClass only over the base vocabulary, and those vocabularies which import it. (`RDF::Vocabulary.imported_from
* Be more forgiving if asking to entail something that's not the right vocabulary term.
* Ignore rdfs:Resource in range.
* Add support for Role class in domain_includes/range_includes.
* ISO 8601 regular expression matcher for schema:Date.