[PATCH] Update wifidog to 20130917 version

-adds a ProxyPort option (to use a local transparent proxy)
-changes http return code to 302 (was 307, but wifidog speaks http 1.0, and we really need 303)
(it was causing some trouble with, for exemple, opera)
-switch to github repo
-correct a small typo
-add drop, log, ulog target for FirewallRule

This is only compile tested, but 3 people are asking for it
https://github.com/wifidog/wifidog-gateway/issues/8

Signed-off-by: Etienne CHAMPETIER <etienne.champetier at free.fr>