Update authors

Author: jzaefferer

AUTHORS.txt

@@ -243,3 +243,8 @@ Zaven Muradyan <megalivoithos@gmail.com>
 Woody Gilk <shadowhand@deviantart.com>
 Zbigniew Motyka <zbigniew.motyka@gmail.com>
 Suhail Alkowaileet <xsoh.k7@gmail.com>
+Toshi MARUYAMA <marutosijp2@yahoo.co.jp>
+David Hansen <hansede@gmail.com>
+Brian Grinstead <briangrinstead@gmail.com>
+Christian Klammer <christian314159@gmail.com>
+Steven Luscher <jquerycla@steveluscher.com>