Django 1.8 alpha 1 support

* Test on Python 2.7, 3.4, pypy.
* Call super.setUpClass in DjrillAdminTests.
  https://docs.djangoproject.com/en/dev/releases/1.8/#overriding-setupclass-teardownclass-in-test-cases

Also clear up some new PendingDeprecationWarnings, where
the changes can easily remain compatible back to Django 1.3:

* Remove deprecated django.conf.urls.patterns.
  (And match Django recommendations in our docs.)
  https://docs.djangoproject.com/en/dev/releases/1.8/#django-conf-urls-patterns
* Remove deprecated SimpleTestCase.urls.
  (We've already back-ported @override_settings
  for testing older Django versions.)
  https://docs.djangoproject.com/en/dev/releases/1.8/#django-test-simpletestcase-urls

docs/installation.rst

@@ -84,10 +84,10 @@ If you want to enable the Djrill admin interface, edit your base :file:`urls.py`
         admin.autodiscover()
         ...
 
-        urlpatterns = patterns('',
+        urlpatterns = [
             ...
             url(r'^admin/', include(admin.site.urls)),
-        )
+        ]
 
 If you are on **Django 1.7 or later,** you will also need to change the config used
 by the django.contrib.admin app in your :file:`settings.py`: