pyRdfa: Removed the special handling of @value (HTML5 does not have the <data> element any more); updated the handling of @datetime (it was bound to the <time> element, which was a mistake).
pyRdfa: Removed the special handling of @value (HTML5 does not have the <data> element any more); updated the handling of @datetime (it was bound to the <time> element, which was a mistake).

marma/rdflib,avorio/rdflib,dbs/rdflib,dbs/rdflib,dbs/rdflib,armandobs14/rdflib,avorio/rdflib,RDFLib/rdflib,RDFLib/rdflib,avorio/rdflib,armandobs14/rdflib,RDFLib/rdflib,ssssam/rdflib,dbs/rdflib,armandobs14/rdflib,RDFLib/rdflib,yingerj/rdflib,yingerj/rdflib,ssssam/rdflib,marma/rdflib,marma/rdflib,avorio/rdflib,yingerj/rdflib,armandobs14/rdflib,marma/rdflib,ssssam/rdflib,ssssam/rdflib,yingerj/rdflib