update a copyright date

build/ignore_helper.pl

 ################################################################################
 # ignore_helper.pl
-# Copyright (c) 2007-2014 Anthony Minessale II <anthm@freeswitch.org>
+# Copyright (c) 2007-2015 Anthony Minessale II <anthm@freeswitch.org>
 # 
 # Permission is hereby granted, free of charge, to any person
 # obtaining a copy of this software and associated documentation