PSR-4 support for #70 plus PhpDoc

SourceQuery/Exception/SourceQueryException.php

@@ -0,0 +1,18 @@
+<?php
+	/**
+	 * @author Pavel Djundik <sourcequery@xpaw.me>
+	 *
+	 * @link https://xpaw.me
+	 * @link https://github.com/xPaw/PHP-Source-Query-Class
+	 *
+	 * @license GNU Lesser General Public License, version 2.1
+	 *
+	 * @internal
+	 */
+
+	namespace xPaw\SourceQuery\Exception;
+
+	abstract class SourceQueryException extends \Exception
+	{
+		// Base exception class
+	}