Added Module Session Authentication with Cookies.

Updated Demo example with the Module Session (Authentication with Cookies)
Fixed little issue with SQL query in OpenID module.

modules/session_auth/site/scripts/session_auth_table.sql.tpl

@@ -0,0 +1,11 @@
+
+CREATE TABLE session_auth (
+   `uid` INTEGER PRIMARY KEY NOT NULL CHECK(`uid`>=0),
+   `access_token` TEXT  NOT NULL,
+   `created` DATETIME NOT NULL,
+   CONSTRAINT `uid`
+    UNIQUE(`uid`),
+   CONSTRAINT `access_token`
+    UNIQUE(`access_token`) 
+   );
+