add a static root to enable modwsgi deployment

Former-commit-id: 71cb8b718c1fec845200a0f64ca49b4d13b3ecd4

ippisite/ippisite/settings.py

@@ -130,6 +130,8 @@ USE_TZ = True
 
 STATIC_URL = '/static/'
 
+STATIC_ROOT = os.path.join(BASE_DIR, 'static_root')
+
 # required to use django-extensions to draw database diagram
 # to do so type
 #$ ./manage.py graph_models -a > db.dot