Update copyright notice in the new footer.

templates/_footer.twig

     <hr>
 
     <img src="/{{ baseurlpath }}resources/icons/ssplogo-fish-small.png" alt="Small fish logo" style="float: right">
-    Copyright © 2007-2015 <a href="http://uninett.no/">UNINETT AS</a>
+    Copyright © 2007-2016 <a href="http://uninett.no/">UNINETT AS</a>
 
     <br style="clear: right">