 If no GOPATH is set, use default path. (#425)
 If no GOPATH is set, use default path. (#425)

If no GOPATH is set, it is assumed to be $HOME/go on Unix systems and %USERPROFILE%\go on Windows. 
href: https://github.com/golang/go/wiki/SettingGOPATH
myodc/micro,micro/micro,micro/micro,micro/micro