Read repo path from the commandline

Default to `.`.

quit.go

	"io"
	"log"
	"net/http"
	"os"
	"strings"
	"time"
)
func main() {
	repo, err := git.OpenRepository("/home/lu/t/libgit2")
	repoPath := "."
	if len(os.Args) > 1 {
		repoPath = os.Args[1]
	}
	repo, err := git.OpenRepository(repoPath)
	if err != nil {
		log.Fatal("opening repository: ", err)
	}
	http.HandleFunc("/", func(w http.ResponseWriter, req *http.Request) {
		buf := new(bytes.Buffer)
		err = repoTmpl.Execute(buf, map[string]interface{}{
			"RepoPath": "~/t/libgit2",
			"RepoPath": repoPath,
			"Repo":     NewFancyRepo(repo),
			"Style":    template.CSS(repoStyle),
		})