make ConstantMapping work with custom URIs
Needed to provide licence information in commons as in gaurav/extraction-framework#7
try with URI, handles more cases
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 pull request #242 from jimkont/constantMappings

make ConstantMapping work with custom URIs