Improve metadata to match package conventions

- Tidy up headers.

- Use meaningful keywords.

  "The name of this field is unfortunate, since people often assume it
  is the place to write arbitrary keywords that describe their package,
  rather than just the relevant Finder keywords."
  -- https://www.gnu.org/software/emacs/manual/html_node/elisp/Library-Headers.html

- Add Homepage.

- Fix "ends here" footer format.

Author: camdez

gist.el

@@ -1,16 +1,16 @@
 ;;; gist.el --- Emacs integration for gist.github.com
 
 ;; Author: Yann Hodique <[email protected]>
-;; Original author: Christian Neukirchen <purl.org/net/chneukirchen>
-;; Contributors:
-;; Chris Wanstrath <[email protected]>
-;; Will Farrington <[email protected]>
-;; Michael Ivey
-;; Phil Hagelberg
-;; Dan McKinley
+;; Original Author: Christian Neukirchen <[email protected]>
+;; Contributors: Chris Wanstrath <[email protected]>
+;;               Will Farrington <[email protected]>
+;;               Michael Ivey
+;;               Phil Hagelberg
+;;               Dan McKinley
 ;; Version: 1.2.1
-;; Keywords: gist git github paste pastie pastebin
 ;; Package-Requires: ((emacs "24.1") (gh "0.8.1"))
+;; Keywords: tools
+;; Homepage: https://github.com/defunkt/gist.el
 
 ;; This file is NOT part of GNU Emacs.
 
@@ -571,4 +571,4 @@ put it into `kill-ring'."
 (define-key dired-mode-map "@" 'dired-do-gist)
 
 (provide 'gist)
-;;; gist.el ends here.
+;;; gist.el ends here