Improve `next` function alias

Since `next` is just there for compatability reasons, it is more
reusable be completely transparent, i.e. Passing every
[keyword]argument.

Now, we don't need to re-define it in the child class with a different
signature.

mwclient/listing.py

@@ -67,9 +67,9 @@ class List(object):
             self.load_chunk()
             return self.__next__(full=full)
 
-    def next(self, full=False):
+    def next(self, *args, **kwargs):
         """ For Python 2.x support """
-        return self.__next__(full)
+        return self.__next__(*args, **kwargs)
 
     def load_chunk(self):
         """Query a new chunk of data
@@ -169,10 +169,6 @@ class GeneratorList(List):
             return mwclient.image.Image(self.site, u'', info)
         return mwclient.page.Page(self.site, u'', info)
 
-    def next(self):
-        """ For Python 2.x support """
-        return self.__next__()
-
     def load_chunk(self):
         # Put this here so that the constructor does not fail
         # on uninitialized sites