sorted AUTHORS by last name and added myself

AUTHORS

 CURRENT DEVELOPERS:
 
-Yann Leboulanger (asterix AT lagaule.org)
-Nikos Kouremenos (kourem AT gmail.com)
-Travis Shirk (travis AT pobox.com)
 Stephan Erb (steve-e AT h3c.de)
+Nikos Kouremenos (kourem AT gmail.com)
+Yann Leboulanger (asterix AT lagaule.org)
 Julien Pivotto (roidelapluie AT gmail.com)
 Jonathan Schleifer (js-gajim AT webkeks.org)
+Travis Shirk (travis AT pobox.com)
+Brendan Taylor (whateley AT gmail.com)
 Jean-Marie Traissard (jim AT lapin.org)
 
 PAST DEVELOPERS:
 
 Stefan Bethge (stefan AT lanpartei.de)
-Dimitur Kirov (dkirov AT gmail.com)
 Vincent Hanquez (tab AT snarc.org)
+Dimitur Kirov (dkirov AT gmail.com)