Clean up test warnings for Django 1.8

* Django 1.8 requires TEMPLATES setting (for admin tests)
* Ignore cycle tag deprecation warnings

One remaining PendingDeprecationWarning: "the imp module is
deprecated in favour of importlib" is coming from six, and has a fix
waiting to land: https://bitbucket.org/gutworth/six/issue/112

runtests.py

@@ -31,7 +31,29 @@ settings.configure(
         'django.contrib.sessions.middleware.SessionMiddleware',
         'django.middleware.csrf.CsrfViewMiddleware',
         'django.contrib.auth.middleware.AuthenticationMiddleware',
-    )
+    ),
+    TEMPLATES=[
+        # Django 1.8 starter-project template settings
+        # (needed for test_admin)
+        {
+            'BACKEND': 'django.template.backends.django.DjangoTemplates',
+            'DIRS': [
+                # insert your TEMPLATE_DIRS here
+            ],
+            'APP_DIRS': True,
+            'OPTIONS': {
+                'context_processors': [
+                    'django.contrib.auth.context_processors.auth',
+                    'django.template.context_processors.debug',
+                    'django.template.context_processors.i18n',
+                    'django.template.context_processors.media',
+                    'django.template.context_processors.static',
+                    'django.template.context_processors.tz',
+                    'django.contrib.messages.context_processors.messages',
+                ],
+            },
+        },
+    ],
 )
 
 try: