func logout(s session.Store, w http.ResponseWriter, r *http.Request) {
next := extractPath(r.URL.Query().Get(keyNextPage))
s.Delete(keyToken)
http.Redirect(w, r, next, codeRedirect)
}
func logout(ctx *macaron.Context, s session.Store) {
next := extractPath(ctx.Query(KEY_NEXT_PAGE))
s.Delete(KEY_TOKEN)
ctx.Redirect(next)
}
func (u *User) Logout(sess session.Store) {
sess.Delete("uid")
}