Made GeoDjango GeometryField stop accepting a 'null' keyword argument as per its deprecation in 1.5.

This includes HttpResponse and co. __init__() methods,
django.shortcuts.render_to_response() and the index(), sitemap() sitemap
app views.

refs #20642.

This is to help other ongoing branches which would benefit from
this functionality.

Add support for Oracle, fix an issue with the repr of RawQuerySet,
add tests and documentations. Also added a 'supports_paramstyle_pyformat'
database feature, True by default, False for SQLite.

Thanks Donald Stufft for review of documentation.

Thanks jefftriplett for the report.

This is useful:
- to force a rollback on the exit of an atomic block without having to
  raise and catch an exception;
- to prevent a rollback after handling an exception manually.

Fix typo

Fixed missing initializations in WSGIRequest. Refs #20619

Thanks to roman for the report.

Add missing preposition in documentation.

uid is now base64 encoded in password reset URLs/views. A backwards compatible
password_reset_confirm view/URL will allow password reset links generated before
this change to continue to work. This view will be removed in Django 1.7.

Thanks jonash for the initial patch and claudep for the review.

Fixed #20462 - Replaced the str() cast introduced in 273dc550 by force_text()

Thanks to noirbizarre for the report and initial patch.

Thanks to Keryn Knight for the report.