Add new app to handle all dependencies

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

mayan/apps/django_gpg/apps.py

@@ -12,12 +12,12 @@ from mayan.apps.common.menus import (
 from mayan.apps.navigation.classes import SourceColumn
 
 from .classes import KeyStub
+from .dependencies import *  # NOQA
 from .links import (
     link_key_delete, link_key_detail, link_key_download, link_key_query,
     link_key_receive, link_key_setup, link_key_upload, link_private_keys,
     link_public_keys
 )
-from .licenses import *  # NOQA
 from .permissions import (
     permission_key_delete, permission_key_download, permission_key_sign,
     permission_key_view