code: func (t *Loader) Directory(dir string, fileExtension string) *BinaryLoader {
  	if dir == "" {
  		dir = DefaultDirectory // the default templates dir
  	}
  	if fileExtension == "" {
  		fileExtension = DefaultExtension
  	} else if fileExtension[0] != '.' { // if missing the start dot
  		fileExtension = "." + fileExtension
  	}
  
  	t.Dir = dir
  	t.Extension = fileExtension
  
  	return &BinaryLoader{Loader: t}
  }
docs: // Directory sets the directory to load from
  // returns the Binary location which is optional