proxy: fix bug of issue CodisLabs#1078 & CodisLabs#1080

    json doesn't support map[int]string, using map[string]string instead

proxy: stats will record error response (including rewritten internel…

… errors)

fe: highlight 'S' button if proxy is primary only

deploy: update scripts

travis: add go1.7.1

docker: call apt-get update first

proxy: auto flush

Update, support go 1.6

add env for ci

Fix, import path to CodisLabs