email-json: add author

Add myself as author and change the copyright date.

src/output-json-email-common.c

@@ -1,4 +1,4 @@
-/* Copyright (C) 2007-2014 Open Information Security Foundation
+/* Copyright (C) 2007-2015 Open Information Security Foundation
  *
  * You can copy, redistribute or modify this Program under the terms of
  * the GNU General Public License version 2 as published by the Free
@@ -19,6 +19,7 @@
  * \file
  *
  * \author Tom DeCanio <td@npulsetech.com>
+ * \author Eric Leblond <eric@regit.org>
  *
  * Implements json common email logging portion of the engine.
  */