New port: www/py-django-common-helpers: Common things every Django app needs

[kai]

Summary

py-django-common consists of the following things:

• Middleware that makes sure a web-app runs either on or without "www" in the domain.

• "SessionManagerBase" base class, that helps in keeping session related code object-oriented and clean.

• "EmailBackend" for authenticating users based on their email, apart from username.

• Custom db fields that can be used in models including a "UniqueHashField" and "RandomHashField".

• Bunch of helpful functions in helper.py

• "render_form_field" template tag that makes rendering form fields easy and DRY.

• Couple of dry response classes: "JsonResponse" and "XMLResponse" in the django_common.http that can be used in views that give json/xml responses.

WWW: https://github.com/tivix/django-common/

Test Plan

• poudriere (11.2-, 12.0-RELEASE, 13.0-CURRENT@r344874 amd64 + i386) for each py27 + py36 flavor -> OK
• portlint -> OK
• Runtime tests -> OK

[miwi]

LGTM