Avoid .emacs.d on the load path, per 24.4 warning
Add @purcell's require-package
No slime-js, no need for specific repos / package
Make sure melpa, marmalade and gnu is all present in archives.
Make sure to fetch package-lists if needed.
Make sure to get slime-js from marmalade
Load magit, clojure-mode and slime-js with elpa if not installed.