Initial commit of Session/Authentication code

Plugin architecture with single Database-backed implementation.

source/lib/SihnonFramework/Auth/Plugin/Database/UserGroup.class.php

@@ -0,0 +1,13 @@
+<?php
+
+class SihnonFramework_Auth_Plugin_Database_UserGroup extends Sihnon_DatabaseObject {
+    
+    protected static $table = 'uergroup';
+    
+    protected $_db_id;
+    protected $_db_user;
+    protected $_db_group;
+    protected $_db_added;
+    
+    
+}