add image/x-citrix-pjpeg mime type

lib/technoweenie/attachment_fu.rb

@@ -30,7 +30,8 @@ module Technoweenie # :nodoc:
       'image/x-xbitmap',
       'application/png',
       'application/x-png',
-      'image/gi_'
+      'image/gi_',
+      'image/x-citrix-pjpeg'
     ]
     mattr_reader :content_types, :tempfile_path, :default_processors
     mattr_writer :tempfile_path