Use the cache

This makes requests following the initial one *much* faster.

quit.go

		log.Fatal("opening repository: ", err)
	}
	fancyRepo := NewFancyRepo(repo)
	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		performance.MeasureRequest(req)
		start := time.Now()
		err = repoTmpl.Execute(buf, map[string]interface{}{
			"RepoPath":    path.Base(repoPath),
			"Repo":        NewFancyRepo(repo),
			"Repo":        fancyRepo,
			"Style":       template.CSS(repoStyle),
			"Performance": performance.Render(req),
		})