Adding Ubuntu 15.10 Wily Werewolf

src/ubuntu.ipxe

@@ -8,6 +8,7 @@ goto ${menu}
 :ubuntu
 set os ubuntu
 menu Ubuntu ${arch_a}
+item wily Ubuntu 15.10 Wily Werewolf
 item vivid Ubuntu 15.04 Vivid Vervet 
 item utopic Ubuntu 14.10 Utopic Unicorn
 item trusty Ubuntu 14.04 LTS Trusty Tahr