Added sync feature

templates/sync.html

@@ -0,0 +1,10 @@
+<h1>Last sync log</h1>
+<form action="/sync" class="pure-form pure-form-stacked" method="POST">
+    <button type="submit" class="pure-button button-error pure-input-1 ">Sync now</button>
+ </form>
+
+<pre>
+    <code>
+{% for line in lines %}{{ line }}{% endfor %}
+    </code>
+</pre>