Remove the smart settings app * import

Signed-off-by: Roberto Rosario <roberto.rosario.gonzalez@gmail.com>

mayan/apps/document_signatures/settings.py

@@ -5,7 +5,7 @@ import os
 from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 
-from mayan.apps.smart_settings import Namespace
+from mayan.apps.smart_settings.classes import Namespace
 
 namespace = Namespace(label=_('Document signatures'), name='signatures')