Adjust example project for Django 1.7.

Author: aaugustin

docs/contributing.rst

@@ -24,7 +24,7 @@ the libraries required for working on the Debug Toolbar::
 
 You can run now run the example application::
 
-    $ DJANGO_SETTINGS_MODULE=example.settings django-admin.py syncdb
+    $ DJANGO_SETTINGS_MODULE=example.settings django-admin.py migrate
     $ DJANGO_SETTINGS_MODULE=example.settings django-admin.py runserver
 
 For convenience, there's an alias for the second command::

example/settings.py

@@ -25,6 +25,14 @@
     'debug_toolbar',
 )
 
+MIDDLEWARE_CLASSES = (
+    'django.middleware.common.CommonMiddleware',
+    'django.contrib.sessions.middleware.SessionMiddleware',
+    'django.contrib.auth.middleware.AuthenticationMiddleware',
+    'django.contrib.messages.middleware.MessageMiddleware',
+    'django.middleware.csrf.CsrfViewMiddleware',
+)
+
 ROOT_URLCONF = 'example.urls'
 
 STATIC_URL = '/static/'