PEP8 cleanups, E501: 79 character long lines.

mayan/apps/documents/settings.py

@@ -1,9 +1,7 @@
 from __future__ import unicode_literals
 
-import os
 import pycountry
 
-from django.conf import settings
 from django.utils.translation import ugettext_lazy as _
 
 from smart_settings import Namespace