Modify smtpd to integrate with Revel.

Add plugin to app.go to start smtpd

app/controllers/app.go

@@ -1,6 +1,9 @@
 package controllers
 
-import "github.com/robfig/revel"
+import (
+	"github.com/jhillyerd/inbucket/app/smtpd"
+	"github.com/robfig/revel"
+)
 
 type Application struct {
 	*rev.Controller
@@ -9,3 +12,20 @@ type Application struct {
 func (c Application) Index() rev.Result {
 	return c.Render()
 }
+
+type SmtpdPlugin struct {
+	rev.EmptyPlugin
+	server *smtpd.Server
+}
+
+func (p SmtpdPlugin) OnAppStart() {
+	domain := rev.Config.StringDefault("smtpd.domain", "localhost")
+	port := rev.Config.IntDefault("smtpd.port", 2500)
+	rev.INFO.Printf("SMTP Daemon plugin init {domain: %v, port: %v}", domain, port)
+	p.server = smtpd.New(domain, port)
+	go p.server.Start()
+}
+
+func init() {
+	rev.RegisterPlugin(SmtpdPlugin{})
+}