Theme: display shaarli version in the footer when logged in

Fixes #778

CHANGELOG.md

@@ -25,6 +25,7 @@ Theming:
     - Introduce a new theme
     - Allow selecting themes/templates from the configuration page
     - New/Edit link form can be submitted using CTRL+Enter in the textarea
+    - Shaarli version is displayed in the footer when logged in 
 - Add plugin placeholders to Atom/RSS feed templates
 - Add OpenSearch to feed templates
 - Add `campaign_` to the URL cleanup pattern list

tpl/default/page.footer.html

@@ -3,7 +3,11 @@
 <div class="pure-g">
   <div class="pure-u-2-24"></div>
   <div id="footer" class="pure-u-20-24">
-    <strong><a href="https://github.com/shaarli/Shaarli">Shaarli</a></strong> &middot;
+    <strong><a href="https://github.com/shaarli/Shaarli">Shaarli</a></strong>
+    {if="isLoggedIn()===true"}
+      {$version}
+    {/if}
+    &middot;
     The personal, minimalist, super-fast, database free, bookmarking service by the Shaarli community &middot;
     <a href="doc/Home.html" rel="nofollow">Documentation</a>
       {loop="$plugins_footer.text"}