Thanks Rob Golding from Zapier for the report.

Thanks Tim Graham for the review.

Allows specifying additional hosts to redirect after login and log out.

Thanks Simon Charette for the review.

Fixed #27171 -- Added unicode_literals and coding preamble to all files in startapp template on Python 2.

The smart_* version should only be used when a lazy string should keep
its lazy status.

Fixed #27108 -- Displayed collectstatic's delete/overwrite warnings only if some files exist in STATIC_ROOT.

libmemcached manages its own connections, so isn't affected by refs #5133.

Partially reverted refs #27054 except for one of the tests as this
solution supersedes that one.

Thanks Shai Berger for the review.

Thanks to Simon Litchfield for the report, Uninen for the initial
patch, akaihola, jamesp, b.schube, and Florian Appoloner for
subsequent patches, tests, and documentation.