* Feature: Router增加RegisterHandlerFunc,用于支持注册go原生http.HandlerFunc形式的函数
* Feature: HttpServer增加RegisterHandlerFunc与RegisterRoute
* Opt: Router增加transferHandlerFunc、transferStaticFileHandler辅助函数
* Example: 修改example/router增加RegisterHandlerFunc示例
* About RegisterHandlerFunc
    - Func: RegisterHandlerFunc(routeMethod string, path string, handler http.HandlerFunc) RouterNode
* How to use RegisterHandlerFunc:
~~~ go
func HandlerFunc(w http.ResponseWriter, r *http.Request){
	w.Write([]byte("go raw http func"))
}

server.RegisterHandlerFunc("GET", "/h/func", HandlerFunc)
~~~
* 2019-11-07 01:00 at ShangHai