Moved admin validation code to classes and have those be class
attributes to the ModelAdmin classes.

Added example of using sitemaps with static views.

Added TransRealMixin to fix i18n global state pollution in the test suite

Note the don't require sessions to be in installed apps.

Fixed #20454: Make Urdu (ur) recognized as RTL language

Fixed #20233 - Full custom user model example isn't really full

A simple docstring to clarify a part of the code that might be confusing to understand

Addition and fix for custom user model example documentation.

https://code.djangoproject.com/ticket/20233

Typo in comment

Add needed Imports to the Documentation

Python2 and how metaclasses are defined

Ticket 20234 20236

Thanks zalew for the suggestion and work on a patch.

Also updated, tweaked and fixed testing documentation.

Added object on SingleObjectMixin returned context,
some code clanup.

Thanks petrvanblokland for reporting and saz for the patch

Thanks wim@ for the suggestion and Nicolas Noé for the patch.

Fixes a Python 3.x regression introduced in a19e9d80

Fixed #20142 -- Added error handling for fixture setup

Thanks to maxbublis for the report and sergeykolosov for the patch.

Fixed #20446 -- Documentation for SmallIntegerField does not clarify 'small'

Thanks bmispelon for the suggestion and djangsters for the patch.