{% url %} not work in Django
There is an earlier error that you did not yet fix:

Error Importing data store piston.gae_store OAuth: "No module named piston.gae_store"

This does not seem to be related to the lines that you change. It will probably even occur when your remove the {% url ...%} completely, right? Try to fix the existing error first.
I have a problem using the tag {% url%} in Django on GAE, I found the problem applying internationalization in JavaScript files, writing:
{% url django.views.i18n.javascript_catalog %}
Django throws the error:

TemplateSyntaxError at / view / test /
Caught ImproperlyConfigured while rendering: Error Importing data
  store piston.gae_store OAuth: "No module named piston.gae_store"

And try other parameters: {% url prueba.views.prueba %}
I get the same error.
If I remove piston throws another error on another package, and if only the URL url.py let me test the latter throws error:

'str' object has no attribute 'resolve'

The final url.py:

urlpatterns = patterns('',
      url(r'^view/', include('website.urls')), )

I hope I can help or show another way to get the url of the JavaScript I want without using {% url django.views.i18n.javascript_catalog %}