#56 Ontograf integration

[Ronald Denaux]

Ontograf does not work with ROO since it depends on the protege-owl project, which has been patched for ROO. This will require to create a fork of the ontograf plugin that works with the patched version of p4owll.

Found interface org.protege.editor.owl.OWLEditorKit, but class was expected
java.lang.IncompatibleClassChangeError: Found interface org.protege.editor.owl.OWLEditorKit, but class was expected
at org.protege.ontograf.common.ProtegeGraphModel.<init>(ProtegeGraphModel.java:86)