Add namespaces d0 and dul for DOLCE ontologies

These namespaces are used in the DBpedia ontology to DOLCE mapping
Merge pull request #246 from dfleischhacker/dolcenamespaces

Add namespaces d0 and dul for DOLCE ontologies
Merge branch 'master' into commons
Merge branch 'commons' of github.com:gaurav/extraction-framework into commons