Add Meteor.js integration support, http://meteor.com

Hi RubaXa,

I'm a package maintainer for [Meteor.js](http://meteor.com), the [most popular full-stack JavaScript framework](http://github.com/meteor/meteor).

We'd love to have an official integration with Sortable, so I'm submitting this PR. All you have to do is create a `RubaXa` account at https://www.meteor.com/ (click Sign In, then Create account). Once you've done that, please let me know, and you'll be able to publish new versions of the package by running

    meteor/publish.sh

Thanks & best regards,
Dan