Concatinating with settings.STATIC_URL is no longer reccomended for creating
URLs to static resources, because it doesn't take the configured storage engine
into account. For example, a site using S3 to store its static files will need
static URLs that link out to S3, rather than relative URLs within the same
domain.
I replaced it with django.contrib.staticfiles.templatetags.staticfiles.static()
in python example code, and the {% static %} tag in template examples.
Most of the samples were already 4-space indented, but a few were using 2-space,
which is both inconsistent and, when it happened with Python code samples,
incompatible with PEP8.
In Django 1.9+ if you do not add: 'builtins': ['overextends.templatetags.overextends_tags'], to your TEMPLATES section you will receive a TemplateSyntaxError when the overextends template files are rendered: "Invalid block tag on line". Including 'builtins': ['overextends.templatetags.overextends_tags'], per the overextends docs (and experience) resolves this error.
https://github.com/stephenmcd/django-overextends
Tim Heap