Better signature support for docstrings

jedi/evaluate/context/klass.py

@@ -32,8 +32,7 @@ py__package__() -> List[str]           Only on modules. For the import system.
 py__path__()                           Only on modules. For the import system.
 py__get__(call_object)                 Only on instances. Simulates
                                        descriptors.
-py__doc__(include_call_signature:      Returns the docstring for a context.
-          bool)
+py__doc__()                            Returns the docstring for a context.
 ====================================== ========================================
 
 """

jedi/evaluate/context/namespace.py

@@ -53,5 +53,8 @@ class ImplicitNamespaceContext(Context, SubModuleDictMixin):
     def py__name__(self):
         return self._fullname
 
+    def is_stub(self):
+        return False
+
     def __repr__(self):
         return '<%s: %s>' % (self.__class__.__name__, self._fullname)