Support for multiple jquery versions, simplified 

* [x] Add support for jquery version in `create`, support versions 1.6 through 2.0
* [x] Use contextify to dynamically load vanilla jQuery (make the main script small)
* [x] Update jsdom to 0.5.5
* [x] Update Grunt to 0.4.1
* [x] Externalize jshint config (to make it available to editors & such)
* [x] Runs on node v0.10.x
* [x] Update Readme
* [x] Refactor the tests & add support for grunt watch on tests
* [x] Setup Travis

All the magic happens in https://github.com/netroy/node-jquery/blob/5fe3ab01e57b48de9e0d619750eae0bb6d921dac/lib/node-jquery.js
Unfortunately due to the previous size of the file, you can't see the diff.

PS: should this be version bump?