Update Copyright

Author: achernya

_includes/footer_basic.html

@@ -1,4 +1,4 @@
 <footer>
   <p class="pull-right"><a href="#">Back to top</a></p>
-  <p>Copyright &copy; 2013 <a href="http://sipb.mit.edu/">MIT SIPB</a> &middot; <a href="/privacy/">Privacy</a> &middot; <a href="http://ist.mit.edu/athena/olh/rules">Rules of Use</a></p>
+  <p>Copyright &copy; 2013-2015 <a href="http://sipb.mit.edu/">MIT SIPB</a> &middot; <a href="/privacy/">Privacy</a> &middot; <a href="http://ist.mit.edu/athena/olh/rules">Rules of Use</a></p>
 </footer>