fix mro usage and all the type stuff (see also my blog post about why dir is wrong). fixes #314, fixes #86

jedi/mixin/builtins.pym

@@ -222,8 +222,7 @@ class str():
     def __init__(self, obj):
         pass
 
-class object():
+
+class type():
     def mro():
-        """ mro() -> list
-        return a type's method resolution order """
         return [object]