Fix "undefined: beego.LevelInfo" in conf.go.

Fixes go/src/github.com/beego/wetalk/setting/conf.go:170: undefined: beego.LevelInfo.
Merge pull request #35 from bsingr/patch-1

Fix "undefined: beego.LevelInfo" in conf.go.
add gobuildyml
Merge pull request #37 from codeskyblue/master

add gobuildyml
Merge pull request #1 from beego/master

更新到最新的wetalk版本