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/mvc/session-controller/main.go

@@ -65,5 +65,5 @@ func main() {
 	// 3. refresh the page some times
 	// 4. close the browser
 	// 5. re-open the browser (if it wasn't in private mode) and re-play 2.
-	app.Run(iris.Addr(":8080"))
+	app.Listen(":8080")
 }