Move file and storage code to the storage app

The setting COMMON_TEMPORARY_DIRECTORY is now
STORAGE_TEMPORARY_DIRECTORY.

Signed-off-by: Roberto Rosario <Roberto.Rosario@mayan-edms.com>

mayan/apps/django_gpg/classes.py

@@ -8,7 +8,7 @@ import gnupg
 
 from django.utils.translation import ugettext_lazy as _
 
-from mayan.apps.common.utils import mkdtemp
+from mayan.apps.storage.utils import mkdtemp
 
 
 class GPGBackend(object):