Add syntax highlighting to certain file types
Add syntax highlighting to certain file types

* Syntax highlight `Appraisals` as Ruby. Used especially for our open
  source libraries.
* Syntax highlight rackup (`config.ru`) files as Ruby. Used in all our
  Ruby web apps. Rails apps are rarely touched but some of the Sinatra
  and Middleman apps are occasionally edited.
* Syntax highlight JSON files as JavaScript. Used in our Trail Map.

kategengler/dotfiles,kategengler/dotfiles