update Piwik to version 2.16 (fixes #91)

www/analytics/core/Plugin/PluginException.php

@@ -0,0 +1,35 @@
+<?php
+/**
+ * Piwik - free/libre analytics platform
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ */
+
+namespace Piwik\Plugin;
+
+use Piwik\Common;
+
+class PluginException extends \Exception
+{
+    public function __construct($pluginName, $message)
+    {
+        $pluginName = Common::sanitizeInputValue($pluginName);
+        $message = Common::sanitizeInputValue($message);
+
+        parent::__construct("There was a problem installing the plugin $pluginName: <br /><br />
+                $message
+                <br /><br />
+                If you want to hide this message you must remove the following line under the [Plugins] entry in your
+                'config/config.ini.php' file to disable this plugin.<br />
+                Plugins[] = $pluginName
+                <br /><br />If this plugin has already been installed, you must add the following line under the
+                [PluginsInstalled] entry in your 'config/config.ini.php' file:<br />
+                PluginsInstalled[] = $pluginName");
+    }
+
+    public function isHtmlMessage()
+    {
+        return true;
+    }
+}