Update package.json using style from generator-hubot

I'm working on extracting the default hubot scripts out into NPM packages, so newly generated bots can use that instead of having them live in a newly generated bot. As part of that, I put together a generator at https://github.com/technicalpickles/generator-hubot (unreleased, but will move it to github or hubot-scripts org once it's done). It looks like you extracted maps.coffee already though, with even a few improvements!

This are some minor cleanups to the package.json:

* re-order the fields to follow sty
* make sure to link to the repository & bugs
* make sure hubot-scripts is a keyword

I think the repository one is the most important, as it took me a bit of googling to track down the source for this. I also intend to eventually use the hubot-scripts keyword as a way to discover scripts on npm.