Add piwik usability

lufi.conf.template

@@ -33,6 +33,11 @@
     # optional, default is 32
     #token_length      => 32,
 
+    # if you want to have piwik statistics, provide a piwik image tracker
+    # only the image tracker is allowed, no javascript
+    # optional, no default
+    #piwik_img         => 'https://piwik.example.org/piwik.php?idsite=1&rec=1',
+
     # broadcast_message which will displayed on the index page
     # optional, no default
     #broadcast_message => 'Maintenance',

templates/layouts/default.html.ep

@@ -52,5 +52,8 @@
                 </div>
             </div>
         </div>
+% if (defined(config('piwik_img'))) {
+        <img src="<%== config('piwik_img') %>" style="border:0" alt="" />
+% }
     </body>
 </html>