Fixed #18403 -- Initialized bad_cookies in SimpleCookie

Thanks Stefano Crosta for the report.
Fixed #21057 -- Prevented FileSystemStorage from leaving temporary files.
Fixed #7467 -- Added a template block to override the admin welcome message.

Thanks Jeff Kowalczyk for the suggestion and rctay for the patch.
Fixed #4574 -- Added CSS classes to the admin calendar widget for better control over styling.
Fixed #21075 - Improved doc for calling call_command with arguments.
Fixed #16534 -- Improved ability to customize DiscoverRunner

Added DiscoverRunner.test_suite and .test_runner attributes.

Thanks tomchristie for the suggestion and jcd for the patch.
Fixed #21083 - Fixed spelling in tutorial.

Thanks jimmy.kjaersgaard at gmail.com for the report.
Fixed #20978 -- Made deletion.SET_NULL more friendly for MigrationWriter.serialize.
Made MigrationWriter look for a "deconstruct" attribute on functions.

Refs #20978.
Fixed #20841 -- Added messages to NotImplementedErrors

Thanks joseph at vertstudios.com for the suggestion.
Fixed test that fails when pytz is installed.

pytz' localize() method is the bane of my life.
Fixed #20919 -- Extended assertRedirects to be able to avoid fetching redirect's response.

Thanks mjtamlyn for the suggestion.
Fixed #5749 -- Added field_name as a key in the _html_output dict

Thanks SmileyChris for the suggestion.
Fixed test errors from 053de6131af83c63ec17d38578889c71de913d24 on py3.2.
Fixed #19298 -- Added MultiValueField.__deepcopy__

Thanks nick.phillips at otago.ac.nz for the report.
Improved deprecation warning for change in form boolean values.

refs #20684

Thanks jacob, jcd, and shai for the suggestions.
Fix broken sphinx reference to staticfiles.
Merge pull request #1611 from thusoy/patch-1

Fix broken sphinx reference to staticfiles.
Prevented arbitrary file inclusion with {% ssi %} tag and relative paths.

Thanks Rainer Koirikivi for the report and draft patch.

This is a security fix; disclosure to follow shortly.
Added 1.4.7/1.5.3 release notes