* switch to composer for qrcode and otp dependencies

* move most OTP-related stuff into userhelper
* remove old phpqrcode and otphp libraries

vendor/chillerlan/php-qrcode/src/QRCodeException.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * Class QRCodeException
+ *
+ * @filesource   QRCodeException.php
+ * @created      27.11.2015
+ * @package      chillerlan\QRCode
+ * @author       Smiley <smiley@chillerlan.net>
+ * @copyright    2015 Smiley
+ * @license      MIT
+ */
+
+namespace chillerlan\QRCode;
+
+class QRCodeException extends \Exception{}