Fixed #12405 -- Added LOGOUT_REDIRECT_URL setting.

After a user logs out via auth.views.logout(), they're redirected
to LOGOUT_REDIRECT_URL if no `next_page` argument is provided.

django/conf/global_settings.py

@@ -489,6 +489,8 @@ LOGIN_URL = '/accounts/login/'
 
 LOGIN_REDIRECT_URL = '/accounts/profile/'
 
+LOGOUT_REDIRECT_URL = None
+
 # The number of days a password reset link is valid for
 PASSWORD_RESET_TIMEOUT_DAYS = 3
 

django/contrib/auth/views.py

@@ -104,6 +104,8 @@ def logout(request, next_page=None,
 
     if next_page is not None:
         next_page = resolve_url(next_page)
+    elif settings.LOGOUT_REDIRECT_URL:
+        next_page = resolve_url(settings.LOGOUT_REDIRECT_URL)
 
     if (redirect_field_name in request.POST or
             redirect_field_name in request.GET):