title: Hook into "cd" change directory with emacs
body: <p>I'm looking to load a local config file for emacs when I "M-x: cd" into a new directory.  Project specific settings.  I'm wondering how'd I'd set this up in my init.el.  I've got a local config setup like</p>
  
  <p>(if (file-exists-p "~/.emacs.d/local.el")
      (load-file "~/.emacs.d/local.el"))</p>