Various code cleanup.

app/Exceptions/Handler.php

@@ -1,4 +1,15 @@
 <?php
+declare(strict_types=1);
+
+
+/**
+ * Handler.php
+ * Copyright (c) 2017 thegrumpydictator@gmail.com
+ * This software may be modified and distributed under the terms of the
+ * Creative Commons Attribution-ShareAlike 4.0 International License.
+ *
+ * See the LICENSE file for details.
+ */
 
 namespace FireflyIII\Exceptions;