Add xbox domains to microsoft.conf (#30)

Source/non_ip/microsoft.conf

@@ -83,5 +83,8 @@ DOMAIN-SUFFIX,windows.net
 DOMAIN-SUFFIX,windowsazure.com
 DOMAIN-SUFFIX,windowsupdate.com
 DOMAIN-SUFFIX,wunderlist.com
+DOMAIN-SUFFIX,xbox.com
+DOMAIN-SUFFIX,xboxlive.com
+DOMAIN-SUFFIX,xboxservices.com
 DOMAIN-SUFFIX,yammer.com
 DOMAIN-SUFFIX,yammerusercontent.com