Issue #2, Issue #5: Migrate doc_fragments, fix missing types in docs.

plugins/module_utils/scale.py

@@ -17,6 +17,7 @@
 # along with Ansible.  If not, see <http://www.gnu.org/licenses/>.
 
 from __future__ import absolute_import, division, print_function
+__metaclass__ = type
 
 import copy
 import math