examples: replace all app.Run(iris.Addr(...)) with app.Listen just for the shake of simplicity, both are doing the same exact thing as it's described on the http listening first example.

Former-commit-id: d20afb2e899aee658a8e0ed1693357798df93462

_examples/file-server/embedding-files-into-app/main.go

@@ -32,5 +32,5 @@ func main() {
 	// http://localhost:8080/static/css/bootstrap.min.css
 	// http://localhost:8080/static/js/jquery-2.1.1.js
 	// http://localhost:8080/static/favicon.ico
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }