Merge pull request from tarsius/font-lock

fontify use-package form
GitHub-reference: https://github.com/jwiegley/use-package/issues/25

diff --cc lisp/use-package/use-package.el
index 5b2cb03580d5c6cde36c7b5633f39e3fbab6c9d9,275a8b9ee4d220378a17599fde60a904120ae734..50fa4edd8adfc7b3351a95d00e95106df2fccc98
--- 1/lisp/use-package/use-package.el
--- 2/lisp/use-package/use-package.el
+++ b/lisp/use-package/use-package.el
@@@ -608,8 -604,13 +608,15 @@@ For full documentation. please see comm
  
  (put 'use-package 'lisp-indent-function 1)
  
+ (defconst use-package-font-lock-keywords
+   '(("(\\(use-package\\)\\> *\\(\\sw+\\)?"
+      (1 font-lock-keyword-face)
+      (2 font-lock-constant-face))))
+ 
+ (font-lock-add-keywords 'emacs-lisp-mode use-package-font-lock-keywords)
+ 
  (provide 'use-package)
 -
 +;; Local Variables:
 +;; indent-tabs-mode: nil
 +;; End:
  ;;; use-package.el ends here