Make Server use the new repo.Handler

This contains all the glue to make Server use the new repo.Handler:

- Remove all old handlers
- Add ServeHTTP to make Server a single http.Handler
- Remove Goji routing and replace by net/http and custom routing logic

Additionally, this implements two-level backup repositories.

cmd/rest-server/main.go

@@ -75,21 +75,6 @@ func tlsSettings() (bool, string, string, error) {
 	return server.TLS, key, cert, nil
 }
 
-func getHandler(server restserver.Server) (http.Handler, error) {
-	mux := restserver.NewHandler(server)
-	if server.NoAuth {
-		log.Println("Authentication disabled")
-		return mux, nil
-	}
-
-	log.Println("Authentication enabled")
-	htpasswdFile, err := restserver.NewHtpasswdFromFile(filepath.Join(server.Path, ".htpasswd"))
-	if err != nil {
-		return nil, fmt.Errorf("cannot load .htpasswd (use --no-auth to disable): %v", err)
-	}
-	return server.AuthHandler(htpasswdFile, mux), nil
-}
-
 func runRoot(cmd *cobra.Command, args []string) error {
 	if showVersion {
 		fmt.Printf("rest-server %s compiled with %v on %v/%v\n", version, runtime.Version(), runtime.GOOS, runtime.GOARCH)
@@ -112,7 +97,13 @@ func runRoot(cmd *cobra.Command, args []string) error {
 		defer pprof.StopCPUProfile()
 	}
 
-	handler, err := getHandler(server)
+	if server.NoAuth {
+		log.Println("Authentication disabled")
+	} else {
+		log.Println("Authentication enabled")
+	}
+
+	handler, err := restserver.NewHandler(&server)
 	if err != nil {
 		log.Fatalf("error: %v", err)
 	}