Fixed #19537 -- Made CheckboxInput._has_changed handle 'False' string

Thanks dibrovsd@gmail.com for the report.
Fixed #16241 -- Ensured the WSGI iterable's close() is always called.

Thanks Graham Dumpleton for the report.
Fixed #19519 -- Fired request_finished in the WSGI iterable's close().
Fixed #19453 -- Ensured that the decorated function's arguments are obfuscated in the @sensitive_variables decorator's frame, in case the variables associated with those arguments were meant to be obfuscated from the decorated function's frame.
Thanks to vzima for the report.
Fixed #17078 -- Made shell use std IPython startup.

This allows for a behavior more in line with what is expected by Ipython
users, e.g. the user namespace is initialized from config files, startup
files.

Thanks Benjamin Ragan-Kelley from the IPython dev team for the patch.
Fixed #19519 again -- Regression in LiveServerTestCase after fd1279a4.
Fixed #19457 -- ImageField size detection failed for some files.

This was caused by PIL raising a zlib truncated stream error since we fed
the parser with chunks instead of the whole image.
Fixed a NameError in geoip/libgeoip if the GeoIP library is not found.

Thx to Bouke Haarsma for the report.
Merge pull request #182 from kspi/patch-1

Correct Lithuanian short date format.
Replaced e.message with e.args[0] in 3aa4b8165da23a2f094d0eeffacbda5484f4c1f6.
Replaced six.reraise with a simple raise.
Added a helper script for managing django translations
Updated our six module to follow upstream changes.

This includes fixes for the java/jython detection and a new license header.

Thanks to Thomas Bartelmess for the report.
Tiny typo fixed in logging docs
Merge pull request #615 from evildmp/patch-3

Tiny typo fixed in logging docs
Removed unusable parameters to empty_form property
Modernized middleware tests.

* Used override_settings consistently -- changes to DEBUG could leak.
* Took advantage of assertRaisesRegexp.
* Fixed indentation -- some code was indented at 2 spaces.
Fixed #19520 - Corrected some misleading docs about template_name_suffix.

Thanks jnns for the report.
Fixed #19549 - Typo in docs/topics/auth/default.txt
Fixed #19547 -- Caching of related instances.

When &'ing or |'ing querysets, wrong values could be cached, and crashes
could happen.

Thanks Marc Tamlyn for figuring out the problem and writing the patch.