title: django-rest-framework browsable API doesn't show login link
body: <p>I am currently following the django-rest-api tutorial. In my urls.py, I created the urlpatterns like this: </p>
  
  <pre><code>urlpatterns = format_suffix_patterns([
      ...
      url(r'^auth/', include('rest_framework.urls', namespace='rest_framework')),
  ])
  </code></pre>
  
  <p>Now when i call any restricted endpoint in my browser, like 127.0.0.1/rest/api/foobar, I get the Browsable API with a 403 Forbidden, which is totally fine. But there is no login link in the top right corner. Why is that? What am I doing wrong?</p>