add better generate

Signed-off-by: Jess Frazelle <acidburn@microsoft.com>

vendor/github.com/docker/distribution/registry/handlers/basicauth.go

@@ -0,0 +1,11 @@
+// +build go1.4
+
+package handlers
+
+import (
+	"net/http"
+)
+
+func basicAuth(r *http.Request) (username, password string, ok bool) {
+	return r.BasicAuth()
+}