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Multiple-namespace URI factory object
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Added new method ``ValueFactory.namespaces()`` that takes a dictionary of the
form `{<prefix>: <namespace>, ...}` and returns a factory object that allows to
create URIs from the strings of the form `<prefix>:<name>`, dispatching the
prefix to corresponding namespace:
>>> prefixes = {'': 'http://this.org#', 'ex': 'http://example.org#'}
>>> nss = conn.getValueFactory().namespaces(prefixes)
>>> nss[':resource']
<http://this.org#resource>
>>> nss('ex:resource')
<http://example.org#resource>