Fix python 2 string iterators.

jedi/evaluate/compiled/fake/builtins.pym

@@ -256,6 +256,11 @@ class str():
     def __init__(self, obj):
         pass
 
+    def strip(self):
+        return str()
+
+    def split(self):
+        return [str()]
 
 class type():
     def mro():