Update of the footer

The footer is now converted in a proper Django template. The css isn't
right yet and the HTML should be cleaned and respect more the structure
of the document (use list for list of links and so on).
Signed-off-by: Matthieu Berjon <matthieu.berjon@inria.fr>

django/templates/_footer.html

+{% load static %}
+
 <div class="container footer-space">
   &nbsp;
 </div>
 <footer class="footer">
     <div class="container">
         <div class="col-md-4 credits">
-          <%#FIXME should have links too%>
-          <img class="img-responsive" src="<%= asset_path('credit.png') %>" alt="inria">
+          <img class="img-responsive" src="{% static 'images/credit.png' %}" alt="inria">
         </div>
         <div class="col-md-8">
             <p class="credit pull-right">
                 <a href="https://wiki.inria.fr/sed_ren/">SED</a>
                 <a href="http://www.irisa.fr/">IRISA</a> /
                 <a href="http://www.inria.fr/centre/rennes">INRIA</a>,
-                <%= Time.now.year %><br />
+                {% now "Y" %}<br />
             </p>
         </div>
     </div>