zrules for msf - because zrules!

zrules.patch

##
# This patch ensures you only get z/OS themed logos when you
# start msfconsole. Cuz why not!
#    Author:  BeS
#      Date:  not yet, but working on it.
#
# Run (from root of your msf install)
#   -   patch -p1 -i zrules.patch
#   -   set or export ZRULES=1
#   -   start msfconsole as normal
#   -   get only SoF's wicked Z MSF logos!
##
diff --git a/lib/msf/ui/banner.rb b/lib/msf/ui/banner.rb
index b6368ea..c9575aa 100644
--- a/lib/msf/ui/banner.rb
+++ b/lib/msf/ui/banner.rb
@@ -44,6 +44,9 @@ module Banner
     # Easter egg (always a cow themed logo): export/set GOCOW=1
     if ENV['GOCOW']
       logos.concat(Dir.glob(::Msf::Config.logos_directory + File::SEPARATOR + 'cow*.txt'))
+    # Easter egg (always a z/OS themed logo): export/set ZRULES=1
+    elsif ENV['ZRULES']
+      logos.concat(Dir.glob(::Msf::Config.logos_directory + File::SEPARATOR + 'zsploit*.txt'))
     # Easter egg (always a halloween themed logo): export/set THISISHALLOWEEN=1
     elsif ( ENV['THISISHALLOWEEN'] || Time.now.strftime("%m%d") == "1031" )
       logos.concat(Dir.glob(::Msf::Config.logos_directory + File::SEPARATOR + '*.hwtxt'))