Update the init script of centos
Fix the pid file in centos init script
fix #44
WiP: add tunnel mode
WiP: handle both ipv4 and ipv6
WiP: finish the udp part
fix a memory corruption
fix the udp tunnel
bump version
Merge branch 'ss-tunnel' of https://github.com/madeye/shadowsocks-libev into ss-tunnel