STATIC_URL not defined in templates

I'm trying to use the map widget and I noticed in the template `{{ STATIC_URL}}`. It seems that only gets added if you add `django.template.context_processors.static` to your context processors. The Django docs seems to suggest using the `static` tag which doesn't require the context processor.

So instead of:
`background-image: url("{{ STATIC_URL }}floppyforms/gis/img/move_vertex_on.png");`

it should be:
`background-image: url("{% static "floppyforms/gis/img/move_vertex_on.png" %}");`
with `{% load static %}` up at the top.

So, I guess you could leave it as, but I didn't notice anything in the docs saying that you needed to have the above mentioned context processor added for some of the default templates to work. The `static` tag works without any changes to settings.