docker: call apt-get update first

proxy: auto flush

Update, support go 1.6

add env for ci

Fix, import path to CodisLabs

license

Update tutorial_zh.md

handle accept error, fix CodisLabs#607

Merge pull request CodisLabs#592 from spinlock/dev3.0

Add codis-fe

roll more files to avoid replace old logs, temporarily fix CodisLabs#542