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've reserved its namespace on [Atmosphere](https://atmospherejs.com/rubaxa/sortable) (Meteor's package directory) and I'm submitting this PR so you can directly publish updated versions. All you have to do is create a `RubaXa` account at https://meteor.com/ (click *SIGN IN*, then *Create account*). After you've done that, please let me know, and I'll add you as a maintainer so you'll be able to publish new versions of the package by running:

    meteor/publish.sh

Thanks & best regards,
Dan