namespace refinement
added a few Graph based visualization experiments for mbco.
Merge https://github.com/ermueller/SemanticMetabolomics
Merge https://github.com/sneumann/SemanticMetabolomics
Clean-up and added new versions of the graphs and .ttl ontology
Fixed errors, added chebi-link
Added examples triples for IPB data
Merge https://github.com/ermueller/SemanticMetabolomics