Add files for /gif me

Allows anyone to use this gif repo for `/gif me <query>` via [hubot-gif-me](https://github.com/parkr/hubot-gif-me). All the user would have to do is install `hubot-gif-me` and set `HUBOT_GIF_INDEX` to `http://gifs.jglovier.com/index.json` and :boom:, it works. :tada: