RDFa Parsing: added the rdfa:Pattern and rdfa:copy feature, as described in the last call of HTML5+RDFa
Merge branch 'master' of https://github.com/RDFLib/rdflib
PyRdfa: Aligned with the LC version of HTML5+RDFa, passes all the current (updated) tests.
Merge branch 'master' of https://github.com/RDFLib/rdflib