Remove version string from admin template

Remove version string from base template

Fixes vertical html layout for BooleanField

`HTMLFormRenderer` renders `BooleanField` field as not checked if vertical layout are used.

Displayed warnings during test suite.

Silenced deprecation warnings on Django 1.8.

Use 'password123' as password for new users in the tutorial

Trying to create a new user on Django 1.9.x with the password 'password'
will fail with the error message 'This password is too common.'. Because
of that it is necessary to change the used password from 'password' to
'password123'.

Fixes docstrings in fields.py

updated readme with commands from recent versions of django

typo in docs - tutorial part 1

Fixes docstrings for `to_choices_dict` and `flatten_choices_dict` functions in fields.py.

Mistakes were introduced in #4d69286e

Fixes AttributeError in HTMLFormRenderer.render

Update Django versions

enhancement #3886 Internationalization in admin interface for authtoken

+ verbose_name in models.Token fields
+ Meta-options verbose_name & verbose_name_plural
+ Labels in AuthTokenSerializer fields in case of usages in Brousable API
+ provide AppConfig class as described in django documentation with verbose_name came through ugettext_lazy

If `HTMLFormRenderer.render` will be called with default arguments,
`AttributeError: 'NoneType' object has no attribute 'get'` will be raised.

Fix syntax errors in docs example

- Add missing comma in kwargs
- Remove spaces around keyword / parameter equals
- Replace incorrect curly brace with parenthesis

Mention Live API Endpoints for DRF Docs

Refactor the `get_queryset` overriding test

Restore the abstract on Token model when the app isn't declared

The fact that we don't import Token from authentication doesn't invalidate
the need for the model to be abstract whenever the authtoken isn't listed
in the INSTALLED_APPS.

Fix broken link format

Login form autofocus

RelatedField get_queryset and context

Update link to Heroku guidelines