chore(doc): add how to restart & env var usage

fix(kcptun): set --nocomp arg right

chore(doc): add ci/docker badge

tune(kcptun): params

add(doc): table for env var

fix(doc) better docker command and add tinc todo

enhance(tcp): try to enable BBR at start

feature(bbr): tcp accelerator from google

upgrade(crypt): use salsa20 as default method

upgrade(shadowsocks): use shadowsocks-libev from Ubuntu 16.10

support(kcptun): add kcptun support

chore(todo)

fix(shell): force show ipv4 address in prompt

todo(kcptun): remember

fix(shell): get right source path