* Architecture: move logger.Logger() to DotWeb.Logger()
* Architecture: add HttpServer.Logger who is a shortcut for DotWeb.Logger()
* Architecture: remove logger.Logger()
* How to use dotweb.Logger in your app:
  ~~~go
  func TestLog(ctx dotweb.Context) error {
  	ctx.HttpServer().Logger().Info(dotweb.LogTarget_Default, "test log")
  	return ctx.WriteString("log page")
  }
  ~~~
* 2019-06-13 12:00