use package.json package.json

Use package.json instead of bundled modules.

It's useful for paas deployments, and for every native modules (like bson, mongodb, etc).

I've had a conversation with @osoner and @gorkem-cetin.
We were talking about updating geoip-lite's country and city data. But as I can see, it is bundled with the module and there's a pull request for auto-updating it: bluesmoon/node-geoip#22

Anyway I created an updater script: https://gist.github.com/oroce/4972816