add PREFIX Support to parseAndAddRule

[crapthings]

something like this would be awesome

h.parsePrefix('http://un.jong.kim/onto#', ':')
h.parsePrefix('http://un.jong.kim/onto#', 'default')

(?x :hasChild ?y) -> (?x a :Person)

[mterdjimi]

Hi, this feature is planned, but after the integration of rdflib.js store in HyLAR.