Email components hierarchy created.

SwiftMailer applied as email solution.

framework/yii/email/swift/autoload.php

@@ -0,0 +1,9 @@
+<?php
+/**
+ * This file attempts to register autoloader for the Swift library, assuming
+ * it is located under the 'vendor' path.
+ *
+ * @var $this \yii\email\swift\Mailer
+ */
+$swiftMailerLibPath = Yii::getAlias('@vendor/swiftmailer/swiftmailer/lib');
+require_once $swiftMailerLibPath . '/swift_required.php';