Initial commit of Session/Authentication code

Plugin architecture with single Database-backed implementation.

source/lib/SihnonFramework/Auth/IPermissionable.class.php

@@ -0,0 +1,9 @@
+<?php
+
+interface SihnonFramework_Auth_IPermissionable {
+    
+    public function isAdministrator(Sihnon_Auth_IUser $user);
+    
+}
+
+?>