Be consistent in args vs kwargs

[lukasjuhrich]

Glancing over the source, I often find kwargs.update(args). Also, in Listing.__init__ of listing.py:

        data = self.site.api(
            'query', (self.generator, self.list_name),
            *[(text_type(k), v) for k, v in six.iteritems(self.args)]
        )

What reason is there for this duality of 2-tuples as arguments vs keyword arguments? Why not just consistently use keyword arguments?

If there is a reason for it, documenting it might be appropriate.