add a simple context#YAML function to render yaml data and make sure that the cookie's values are url escaped and unescaped when retrieve from client's headers

Former-commit-id: cad1e09679f6b646c12bb6ffdeba62738bdeef5d

mvc/ideas/1/TODO.txt

@@ -1,2 +0,0 @@
-Remove the "ideas" folder or move this example somewhere in the _examples/mvc or even make a https://medium.com/@kataras
-small tutorial about Iris' new MVC implementation.

mvc/ideas/1/main.go

@@ -1,98 +0,0 @@
-package main
-
-import (
-	"fmt"
-
-	"github.com/kataras/iris"
-	"github.com/kataras/iris/sessions"
-
-	"github.com/kataras/iris/mvc"
-)
-
-// TODO: It's not here but this file is what I'll see before the commit in order to delete it:
-// Think a way to simplify the router cycle, I did create it to support any type of router
-// but as I see nobody wants to override the iris router's behavior(I'm not speaking about wrapper, this will stay of course because it's useful on security-critical middlewares) because it's the best by far.
-// Therefore I should reduce some "freedom of change" for the shake of code maintanability in the core/router files: handler.go | router.go and single change on APIBuilder's field.
-func main() {
-	app := iris.New()
-	app.Logger().SetLevel("debug")
-	mvc.Configure(app.Party("/todo"), TodoApp)
-
-	app.Run(iris.Addr(":8080"))
-}
-
-func TodoApp(app *mvc.Application) {
-	// You can use normal middlewares at MVC apps of course.
-	app.Router.Use(func(ctx iris.Context) {
-		ctx.Application().Logger().Infof("Path: %s", ctx.Path())
-		ctx.Next()
-	})
-
-	// Register dependencies which will be binding to the controller(s),
-	// can be either a function which accepts an iris.Context and returns a single value (dynamic binding)
-	// or a static struct value (service).
-	app.Register(
-		sessions.New(sessions.Config{}).Start,
-		&prefixedLogger{prefix: "DEV"},
-	)
-
-	app.Handle(new(TodoController))
-
-	// All dependencies of the parent *mvc.Application
-	// are cloned to that new child, thefore it has access to the same session as well.
-	app.Party("/sub").
-		Handle(new(TodoSubController))
-}
-
-// If controller's fields (or even its functions) expecting an interface
-// but a struct value is binded then it will check if that struct value implements
-// the interface and if true then it will bind it as expected.
-
-type LoggerService interface {
-	Log(string)
-}
-
-type prefixedLogger struct {
-	prefix string
-}
-
-func (s *prefixedLogger) Log(msg string) {
-	fmt.Printf("%s: %s\n", s.prefix, msg)
-}
-
-type TodoController struct {
-	Logger LoggerService
-
-	Session *sessions.Session
-}
-
-func (c *TodoController) BeforeActivation(b mvc.BeforeActivation) {
-	b.Handle("GET", "/custom", "Custom")
-}
-
-func (c *TodoController) AfterActivation(a mvc.AfterActivation) {
-	if a.Singleton() {
-		panic("TodoController should be stateless, a request-scoped, we have a 'Session' which depends on the context.")
-	}
-}
-
-func (c *TodoController) Get() string {
-	count := c.Session.Increment("count", 1)
-
-	body := fmt.Sprintf("Hello from TodoController\nTotal visits from you: %d", count)
-	c.Logger.Log(body)
-	return body
-}
-
-func (c *TodoController) Custom() string {
-	return "custom"
-}
-
-type TodoSubController struct {
-	Session *sessions.Session
-}
-
-func (c *TodoSubController) Get() string {
-	count, _ := c.Session.GetIntDefault("count", 1)
-	return fmt.Sprintf("Hello from TodoSubController.\nRead-only visits count: %d", count)
-}