Show thumbnails in a `archive-mode' buffer like `image-dired'. So
this module depend on `image-dired' to imitate UI.  Some of
customize variables are imported.  But not like image-dired,
non-blocking thumbnail process like `image-dired+'

## Install:

Please install the ImageMagick before installing this elisp.

Put this file into load-path'ed directory, and byte compile it if
desired. And put the following expression into your ~/.emacs.

    (autoload 'image-archive "image-archive" nil t)
    (autoload 'image-archive-marked-files "image-archive" nil t)
    (autoload 'image-archive-auto-thumbnails "image-archive")

## Usage:

* Followings are tested result (`-` is not yet tested) .

| zip |  7z | lha | arc | zoo |
|-----|-----|-----|-----|-----|
|  o  |  o  |  o  |  -  |  -  |

  GNU bash, version 4.2.37(1)-release (x86_64-pc-linux-gnu)

* Type following in archive (e.g. zip) file which contains
  image files.

    M-x image-archive

* Automatically execute `image-archive' when open an archive file.

    (add-hook 'archive-mode-hook 'image-archive-auto-thumbnails)