add piwik installation

www/analytics/core/DataTable/Bridges.php

@@ -0,0 +1,28 @@
+<?php
+/**
+ * Piwik - Open source web analytics
+ *
+ * @link http://piwik.org
+ * @license http://www.gnu.org/licenses/gpl-3.0.html GPL v3 or later
+ *
+ */
+
+/**
+ * This contains the bridge classes which were used prior to Piwik 2.0
+ * The serialized reports contains these classes below, which were not using namespaces yet
+ */
+namespace {
+
+    use Piwik\DataTable\Row\DataTableSummaryRow;
+    use Piwik\DataTable\Row;
+
+    class Piwik_DataTable_Row_DataTableSummary extends DataTableSummaryRow
+    {
+    }
+
+    class Piwik_DataTable_Row extends Row
+    {
+    }
+
+}
+