title: Django, redirect all non-authenticated users to landing page
body: <p>I have a django website with many urls and views. Now I have asked to redirect all non-authenticated users to a certain landing page. So, all views must check if <code>user.is_authenticated()</code> and return to a new set of landing pages. </p>
  
  <p>Can it be done in a pretty way, instead of messing with my <code>views.py</code>/<code>urls.py</code> that much?</p>