Change MELPA URL.

Changed URL for MELPA in accordance with http://irreal.org/blog/?p=3380.

Author: Rick Hanson

Diff for: starter-kit.org

@@ -286,7 +286,7 @@ interested in the actual code implementing the starter kit.
         (setq package-archives
               '(("gnu"         . "http://elpa.gnu.org/packages/")
                 ("org"         . "http://orgmode.org/elpa/")
-                ("melpa"       . "http://melpa.milkbox.net/packages/")
+                ("melpa"       . "http://melpa.org/packages/")
                 ("marmalade"   . "http://marmalade-repo.org/packages/")))
         (package-initialize)