install-cider.el

(require 'package)
(add-to-list 'package-archives
	     '("marmalade" . "http://marmalade-repo.org/packages/") t)
(add-to-list 'package-archives
	     '("tromey" . "http://tromey.com/elpa/") t)
(add-to-list 'package-archives
	     '("melpa" . "http://melpa.milkbox.net/packages/") t)
(package-initialize)
(when (not package-archive-contents)
  (package-refresh-contents))
(defvar my-packages '(better-defaults
		      projectile
		      clojure-mode
		      cider))
(dolist (p my-packages)
  (unless (package-installed-p p)
    (package-install p)))