Add task manager app.

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

mayan/apps/metadata/apps.py

@@ -41,6 +41,7 @@ from .permissions import (
     permission_metadata_document_add, permission_metadata_document_edit,
     permission_metadata_document_remove, permission_metadata_document_view
 )
+from .queues import *  # NOQA
 from .search import metadata_type_search  # NOQA
 from .widgets import get_metadata_string