add piwik installation

www/analytics/plugins/Overlay/templates/index_noframe.twig

@@ -0,0 +1,21 @@
+{% extends 'dashboard.twig' %}
+
+{% block content %}
+<h1>{{ 'Overlay_Overlay'|translate }}</h1>
+
+<div id="Overlay_NoFrame">
+
+    <script type="text/javascript">
+        var newLocation = 'index.php?module=Overlay&action=startOverlaySession&idSite={{ idSite }}&period={{ period }}&date={{ date }}';
+
+        var locationParts = window.location.href.split('#');
+        if (locationParts.length > 1) {
+            var url = broadcast.getParamValue('l', locationParts[1]);
+            url = Overlay_Helper.decodeFrameUrl(url);
+            newLocation += '#' + url;
+        }
+        window.location.href = newLocation;
+    </script>
+
+</div>
+{% endblock %}