invoke()

func (a *Alfred) invoke(method string, args ...interface{}) chan bool {
	finished := make(chan bool)
	params := make([]reflect.Value, len(args))
	for idx := range args {
		params[idx] = reflect.ValueOf(args[idx])
	}
	reflect.ValueOf(a).MethodByName(strings.Title(strings.ToLower(method))).Call(params)
	return finished
}