Added two newer units
Updated the ChEMBL-RDF example, citing the paper
Use the example environment
Added the Unit Ontology mappings
Updated the mapping list, matching jQUDT of today
Updated the list of OPS specific units
Releasind the first WD
Some tweaks to make it work online
Added link to the QUDT website (thanx to Alasdair)
Added the namespaces at the start of the document (suggested by and thanks to Alasdair)
Merge branch 'ew-units-primer'