init go modules but keep the dep files and vendor folder and update badger sessionsdb's dependency to 1.5.4 from 1.5.3

Former-commit-id: 4f58a9bd0e7eb5f9535953125c27b9c5316ffc0f

_examples/http-listening/iris-configurator-and-host-configurator/README.md

@@ -1,2 +0,0 @@
-A silly example for this issue: https://github.com/kataras/iris/issues/688#issuecomment-318828259.
-However it seems useful and therefore is being included in the examples for everyone else.

_examples/http-listening/iris-configurator-and-host-configurator/counter/configurator.go

@@ -1,30 +0,0 @@
-package counter
-
-import (
-	"time"
-
-	"github.com/kataras/iris"
-	"github.com/kataras/iris/core/host"
-)
-
-func Configurator(app *iris.Application) {
-	counterValue := 0
-
-	go func() {
-		ticker := time.NewTicker(time.Second)
-
-		for range ticker.C {
-			counterValue++
-		}
-
-		app.ConfigureHost(func(h *host.Supervisor) { // <- HERE: IMPORTANT
-			h.RegisterOnShutdown(func() {
-				ticker.Stop()
-			})
-		}) // or put the ticker outside of the gofunc and put the configurator before or after the app.Get, outside of this gofunc
-	}()
-
-	app.Get("/counter", func(ctx iris.Context) {
-		ctx.Writef("Counter value = %d", counterValue)
-	})
-}

_examples/http-listening/iris-configurator-and-host-configurator/main.go

@@ -1,14 +1,28 @@
 package main
 
 import (
-	"github.com/kataras/iris/_examples/http-listening/iris-configurator-and-host-configurator/counter"
-
 	"github.com/kataras/iris"
 )
 
 func main() {
 	app := iris.New()
-	app.Configure(counter.Configurator)
 
-	app.Run(iris.Addr(":8080"))
+	app.ConfigureHost(func(host *iris.Supervisor) { // <- HERE: IMPORTANT
+		// You can control the flow or defer something using some of the host's methods:
+		// host.RegisterOnError
+		// host.RegisterOnServe
+		host.RegisterOnShutdown(func() {
+			app.Logger().Infof("Application shutdown on signal")
+		})
+	})
+
+	app.Get("/", func(ctx iris.Context) {
+		ctx.HTML("<h1>Hello</h1>\n")
+	})
+
+	app.Run(iris.Addr(":8080"), iris.WithoutServerError(iris.ErrServerClosed))
+
+	/* There are more easy ways to notify for global shutdown using the `iris.RegisterOnInterrupt` for default signal interrupt events.
+	You can even go it even further by looking at the: "graceful-shutdown" example.
+	*/
 }

_examples/http-listening/notify-on-shutdown/main.go

@@ -1,11 +1,10 @@
 package main
 
 import (
-	stdContext "context"
+	"context"
 	"time"
 
 	"github.com/kataras/iris"
-	"github.com/kataras/iris/core/host"
 )
 
 func main() {
@@ -15,20 +14,20 @@ func main() {
 		ctx.HTML("<h1>Hello, try to refresh the page after ~10 secs</h1>")
 	})
 
-	// app.ConfigureHost(configureHost) -> or pass "configureHost" as `app.Addr` argument, same result.
-
 	app.Logger().Info("Wait 10 seconds and check your terminal again")
 	// simulate a shutdown action here...
 	go func() {
 		<-time.After(10 * time.Second)
 		timeout := 5 * time.Second
-		ctx, cancel := stdContext.WithTimeout(stdContext.Background(), timeout)
+		ctx, cancel := context.WithTimeout(context.Background(), timeout)
 		defer cancel()
 		// close all hosts, this will notify the callback we had register
 		// inside the `configureHost` func.
 		app.Shutdown(ctx)
 	}()
 
+	// app.ConfigureHost(configureHost) -> or pass "configureHost" as `app.Addr` argument, same result.
+
 	// start the server as usual, the only difference is that
 	// we're adding a second (optional) function
 	// to configure the just-created host supervisor.
@@ -37,9 +36,14 @@ func main() {
 	// wait 10 seconds and check your terminal.
 	app.Run(iris.Addr(":8080", configureHost), iris.WithoutServerError(iris.ErrServerClosed))
 
+	/*
+		Or for simple cases you can just use the:
+		iris.RegisterOnInterrupt for global catch of the CTRL/CMD+C and OS events.
+		Look at the "graceful-shutdown" example for more.
+	*/
 }
 
-func configureHost(su *host.Supervisor) {
+func configureHost(su *iris.Supervisor) {
 	// here we have full access to the host that will be created
 	// inside the `app.Run` function or `NewHost`.
 	//