Deprecate package in favor of the official version

Hi @garrilla,

I'm a fellow Meteor dev and [volunteer package curator on Atmosphere](https://github.com/percolatestudio/atmosphere-beta/issues/297). I found your d3.js wrapper and used it as inspiration for an [official d3 <-> Meteor integration](https://github.com/mbostock/d3/pull/2130).

d3.js now has an official package published at https://atmospherejs.com/d3js/d3, with integration straight from the source repo, so the package will always be up to date.

Would you like to support this official version? If so, you can run

    meteor admin set-unmigrated garilla:d3

Packages and apps that depend on your wrapper will still run fine; the package will only be hidden from Atmosphere searches.

Thanks!

Dan