gistfile1.txt

(progn
  (switch-to-buffer
    (url-retrieve-synchronously
      "https://raw.github.com/milkypostman/package-filter/master/package-filter.el"))
  (package-install-from-buffer  (package-buffer-info) 'single))

(require 'package) ;; You might already have this line
(add-to-list 'package-archives
'("melpa" . "https://melpa.org/packages/"))
(when (< emacs-major-version 24)
;; For important compatibility libraries like cl-lib
(add-to-list 'package-archives '("gnu" . "http://elpa.gnu.org/packages/")))
(package-initialize) ;; You might already have this line