fix buf idx/len, fix mss

Merge pull request shadowsocks#410 from librehat/master

update rpm scripts

bump version

bump version

disable iv check for rc4

fix a build issue

enlarge min UDP relay timeout

increase max udp timeout to 60s

bump version

Merge pull request shadowsocks#308 from shadowsocks/tproxy-int

Add TPROXY support for redir mode