re-enable the interpretation of the None keyword

jedi/evaluate/compiled/fake/builtins.pym

@@ -13,7 +13,8 @@ def next(iterator, default=None):
         else:
             return iterator.__next__()
     else:
-        return default
+        if default is not None:
+            return default
 
 
 def iter(collection, sentinel=None):

jedi/evaluate/finder.py

@@ -39,11 +39,6 @@ class NameFinder(object):
 
     @debug.increase_indent
     def find(self, scopes, resolve_decorator=True, search_global=False):
-        if unicode(self.name_str) == 'None':
-            # Filter None, because it's really just a keyword, nobody wants to
-            # access it.
-            return []
-
         names = self.filter_name(scopes)
         types = self._names_to_types(names, resolve_decorator)