Little, easy improvements

Here's a list of selected improvements that we'd like to make to Django. The easiest fixes can be found via the "Easy" tickets link on ​dashboard.djangoproject.com.

If you don't feel like writing Python, you can always help with patches needing documentation or, between coding and documenting, you can give a hand with the patches needing tests, or patches that need some other improvement.

Below are some more substantial changes that have been started but abandoned and could probably be finished without too much difficulty.

Ticket	Description
#20223	Address review comments for ​Fixed #20223 -- Added keep_lazy() as a replacement for allow_lazy().
#21429	Address review comments on ​Fixed #21429 -- Added builtin logging support to BaseCommand.
#24994	Addressed review comments on ​Fixed #24994 -- Documented, checked that settings.SECRET_KEY is valid unicode string.
#25135	Address review comments on ​Fixed #25135 -- Deprecated the contrib.admin allow_tags attribute
#20846	Address review comments on ​Fixed #20846 -- Change username max_length to 254

Feel free to reach out to Tim Graham (timograham on #django-dev IRC) if you have any questions about these tasks.