rope_magic

everyone know in china is GFW block a lot of ip address or domain name. btsync also can't connect to tracker server so it can't work. but maybe there is a other way to fix it. a lot of people in china use shadowsocks (socks5 proxy) to cross the GFW. but almost shadowsocks server has traffic limit,so they can't use proxy to download or upload some thing. so i think maybe btsync can make one option for user. only use socks5 proxy connect to btsync tracker server. but use direction to other peer.