Fix for json mode

Hey Josh, thanks for sharing your emacs config! It's a BIG help. As weird as it feels doing a PR to someone else's dotdir, I just thought I would contribute this minor fix to a json error when emacs loads. Thanks again. Here's the error it spit out:
```File error: Cannot open load file, /home/ianrossi/.emacs.d/elpa/json-1.2/json.el```