* added dibi::date & dibi::datetime

* DibiConnection::insertId && affectedRows throws exception on failure
* added protected throwException() to drivers
* DibiPostgreDriver - can build connection string
* DibiSqliteDriver - support for parameters 'format:date' & 'format:datetime'
* fixed query errors in DibiSqliteDriver
* DibiConnection prevents serialization and multiple transactions

examples/transaction.php

@@ -0,0 +1,28 @@
+<h1>dibi transaction example</h1>
+<pre>
+<?php
+
+require_once '../dibi/dibi.php';
+
+
+dibi::connect(array(
+    'driver'   => 'sqlite',
+    'database' => 'sample.sdb',
+));
+
+
+echo "<h2>Before:</h2>\n";
+dibi::query('SELECT * FROM [products]')->dump();
+
+
+
+dibi::begin();
+dibi::query('INSERT INTO [products]', array(
+    'title' => 'Test product',
+));
+dibi::rollback(); // or dibi::commit();
+
+
+
+echo "<h2>After:</h2>\n";
+dibi::query('SELECT * FROM [products]')->dump();