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

djrill/tests/test_admin.py

@@ -7,6 +7,8 @@ import six
 
 from djrill.tests.mock_backend import DjrillBackendMockAPITestCase
 
+from .utils import override_settings
+
 
 def reset_admin_site():
     """Return the Django admin globals to their original state"""
@@ -15,14 +17,13 @@ def reset_admin_site():
         del sys.modules['djrill.admin'] # force autodiscover to re-import
 
 
+@override_settings(ROOT_URLCONF='djrill.tests.admin_urls')
 class DjrillAdminTests(DjrillBackendMockAPITestCase):
     """Test the Djrill admin site"""
 
-    # These urls set up the DjrillAdminSite as suggested in the readme
-    urls = 'djrill.tests.admin_urls'
-
     @classmethod
     def setUpClass(cls):
+        super(DjrillAdminTests, cls).setUpClass()
         # Other test cases may muck with the Django admin site globals,
         # so return it to the default state before loading test_admin_urls
         reset_admin_site()