Emacs Init Package

init-package.el

;; Requisites: Emacs >= 24
(require 'package)
(package-initialize)

(add-to-list 'package-archives
	     '("melpa" . "http://melpa.milkbox.net/packages/"))
(add-to-list 'package-archives
	     '("marmalade" . "http://marmalade-repo.org/packages/") t)

(package-refresh-contents)

(defun install-if-needed (package)
  (unless (package-installed-p package)
    (package-install package)))