Revert "removed MsSqlDriver (is not available with PHP 5.3 or later; replaced with SqlsrvDriver)"

This reverts commit ac1ab26e7a.

examples/connecting-to-databases.php

@@ -112,6 +112,22 @@ try {
 echo "</p>\n";
 
 
+// connects to MS SQL
+echo '<p>Connecting to MS SQL: ';
+try {
+	dibi::connect([
+		'driver' => 'mssql',
+		'host' => 'localhost',
+		'username' => 'root',
+		'password' => 'xxx',
+	]);
+	echo 'OK';
+} catch (Dibi\Exception $e) {
+	echo get_class($e), ': ', $e->getMessage(), "\n";
+}
+echo "</p>\n";
+
+
 // connects to SQLSRV
 echo '<p>Connecting to Microsoft SQL Server: ';
 try {