Removing “envy” dependency?

[dcelasun]

Depending on envy to get the GOPATH introduces a long chain of dependencies that could be avoided. Something like:

func GoPath() string {
	p := strings.Split(os.Getenv("GOPATH"), string(os.PathListSeparator))
	if len(p) == 0 || p[0] == "" {
		return build.Default.GOPATH
	}
	return p[0]
}

Would it be possible to switch to something like this? Using packr in a project that vendors and commits its dependencies adds a lot of unnecessary files.