* New Feature: HttpServer & Router add RegisterServerFile use to register ServerFile router with routeMethod method on http.FileServer
* Update: ServerFile add support for EnabledAutoHEAD\EnabledAutoOPTIONS
* Detail:
    - when use ServerFile, default routeMethod is GET
    - you can use RegisterServerFile specify other HttpMethod, like "POST"
* Example:
``` golang
	server.RegisterServerFile(dotweb.RouteMethod_POST, "/dst/*", "/home/www/")
```
* How To:
  - how to add support "HEAD" method for all requests in your httpserver?
  ~~~go
  func main() {
  	app := dotweb.Classic("/home/logs/wwwroot/")

    // if use this, all router will auto add "HEAD" method support
    // default is false
    app.HttpServer.SetEnabledAutoHEAD(true)

  	app.HttpServer.GET("/index", func(ctx dotweb.Context) error{
  		return ctx.WriteString("welcome to my first web!")
  	})

  	err := app.StartServer(80)
      fmt.Println("dotweb.StartServer error => ", err)
  }
  ~~~
* 2019-01-03 10:00