Update vendor for Pug (Jade) Parser and add Iris + Pug examples in the _examples/view folder, relative to https://github.com/kataras/iris/issues/1003

Former-commit-id: e26a5701e00ec055f3bcf693c1980c7d22147310

_examples/view/template_pug_0/main.go

@@ -0,0 +1,29 @@
+package main
+
+import "github.com/kataras/iris"
+
+func main() {
+	app := iris.New()
+
+	tmpl := iris.Pug("./templates", ".pug")
+	tmpl.Reload(true)                             // reload templates on each request (development mode)
+	tmpl.AddFunc("greet", func(s string) string { // add your template func here.
+		return "Greetings " + s + "!"
+	})
+
+	app.RegisterView(tmpl)
+
+	app.Get("/", index)
+
+	// http://localhost:8080
+	app.Run(iris.Addr(":8080"))
+}
+
+func index(ctx iris.Context) {
+	ctx.ViewData("pageTitle", "My Index Page")
+	ctx.ViewData("youAreUsingJade", true)
+	// Q: why need extension .pug?
+	// A: Because you can register more than one view engine per Iris application.
+	ctx.View("index.pug")
+
+}

_examples/view/template_pug_0/templates/index.pug

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+mixin withGo
+  | Generating Go html/template output.
+
+doctype html
+html(lang="en")
+  head
+    title= .pageTitle
+    script(type='text/javascript').
+      if (foo) {
+         bar(1 + 5)
+      }
+  body
+    h1 Jade - template engine
+    #container.col
+      if .youAreUsingJade
+        p {{ greet "iris user" }} <!-- execute template funcs -->
+        p You are amazing!
+      else
+        p Get on it!
+      p.
+        Jade is #[a(terse)] and simple
+        templating language with a
+        #[strong focus] on performance
+        and powerful features.
+      + withGo

_examples/view/template_pug_1/main.go

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+// Package main shows an example of pug actions based on https://github.com/Joker/jade/tree/master/example/actions
+package main
+
+import "github.com/kataras/iris"
+
+type Person struct {
+	Name   string
+	Age    int
+	Emails []string
+	Jobs   []*Job
+}
+
+type Job struct {
+	Employer string
+	Role     string
+}
+
+func main() {
+	app := iris.New()
+
+	tmpl := iris.Pug("./templates", ".pug")
+	app.RegisterView(tmpl)
+
+	app.Get("/", index)
+
+	// http://localhost:8080
+	app.Run(iris.Addr(":8080"))
+}
+
+func index(ctx iris.Context) {
+	job1 := Job{Employer: "Monash B", Role: "Honorary"}
+	job2 := Job{Employer: "Box Hill", Role: "Head of HE"}
+
+	person := Person{
+		Name:   "jan",
+		Age:    50,
+		Emails: []string{"jan@newmarch.name", "jan.newmarch@gmail.com"},
+		Jobs:   []*Job{&job1, &job2},
+	}
+
+	ctx.View("index.pug", person)
+}

_examples/view/template_pug_1/templates/index.pug

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+doctype html
+html(lang="en")
+	head
+		meta(charset="utf-8")
+		title Title
+	body
+		p ads
+		ul
+			li The name is {{.Name}}.
+			li The age is {{.Age}}.
+
+		each _,_ in .Emails
+			div An email is {{.}}
+
+		| {{ with .Jobs }}
+			each _,_ in .
+				div
+				 An employer is {{.Employer}}
+				 and the role is {{.Role}}
+		| {{ end }}

_examples/view/template_pug_2/main.go

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+package main
+
+import (
+	"html/template"
+
+	"github.com/kataras/iris"
+)
+
+func main() {
+	app := iris.New()
+
+	tmpl := iris.Pug("./templates", ".pug")
+	tmpl.Reload(true)                                            // reload templates on each request (development mode)
+	tmpl.AddFunc("bold", func(s string) (template.HTML, error) { // add your template func here.
+		return template.HTML("<b>" + s + "</b>"), nil
+	})
+
+	app.RegisterView(tmpl)
+
+	app.Get("/", index)
+
+	// http://localhost:8080
+	app.Run(iris.Addr(":8080"))
+}
+
+func index(ctx iris.Context) {
+	ctx.View("index.pug")
+}

_examples/view/template_pug_2/templates/footer.pug

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+#footer
+  p Copyright (c) foobar

_examples/view/template_pug_2/templates/header.pug

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+head
+  title My Site
+  <!-- script(src='/javascripts/jquery.js')
+  script(src='/javascripts/app.js') -->

_examples/view/template_pug_2/templates/index.pug

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+doctype html
+html
+  include templates/header.pug
+  body
+    h1 My Site
+    p {{ bold "Welcome to my super lame site."}}
+    include templates/footer.pug

_examples/view/template_pug_3/main.go

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+package main
+
+import "github.com/kataras/iris"
+
+func main() {
+	app := iris.New()
+
+	tmpl := iris.Pug("./templates", ".pug")
+
+	app.RegisterView(tmpl)
+
+	app.Get("/", index)
+
+	// http://localhost:8080
+	app.Run(iris.Addr(":8080"))
+}
+
+func index(ctx iris.Context) {
+	ctx.View("index.pug")
+}

_examples/view/template_pug_3/templates/index.pug

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+extends templates/layout.pug
+
+block title
+  title Article Title
+
+block content
+  h1 My Article

_examples/view/template_pug_3/templates/layout.pug

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+doctype html
+html
+  head
+    block title
+      title Default title
+  body
+    block content