* New Feature: Add Renderer.RegisterTemplateFunc, used to register template func in renderer
* Detail:
  - now inner support inner func like unescaped
  - you can view example on example/render
* Example:
  ``` golang
  app.HttpServer.Renderer().RegisterTemplateFunc("echo", func(x string) interface{}{
  		return "echo:" + x
  	})
  ```
* 2018-09-07