reverse_named_url fails on Django 1.5 if using url arguments

[SpectralAngel]

While migrating an app to Django 1.5 one of my menus handled by treemenus started to fail, it was looking for an url named this way:

"my_awesome_url its_awesome_argument"

All as a single url, this commit fixes that, but i owe you a test case.

[jphalip]

Hello and thanks for the patch. If you could provide a test, that would be great. That would also clarify the issue you've run into. Cheers!

[leliocampanile]

I'm trying this patch and it works for me with django 1.5.1.

[cary929]

https://docs.djangoproject.com/en/1.8/ref/templates/builtins/#std:templatetag-url

try to use 'url' to replace 'reverse_named_url' :)

just like :

{{ menu_item.caption }}