Requirejs plugin : async.js [ To load async dependencies like google maps and jsonp ]

#### Where I downloaded the script ?

* Google - [`requirejs async plugin`](http://lmgtfy.com/?q=requirejs+async+plugin)
* We got (320 followers) - [millermedeiros/requirejs-plugins](https://github.com/millermedeiros/requirejs-plugins)
* `async : Useful for JSONP and asynchronous dependencies (e.g. Google Maps).`
* So, I downloaded `async.js` from [async.js](https://raw.github.com/millermedeiros/requirejs-plugins/master/src/async.js)
* Examples to support the unanimous acceptability of the plugin : 
  * Tutorial - [RequireJS 2.0 Delayed Module Evaluation and Google Maps](http://blog.millermedeiros.com/requirejs-2-0-delayed-module-evaluation-and-google-maps/)
  * [google-maps-hello-world](https://github.com/p15martin/google-maps-hello-world/tree/master/js/libs)

#### If it isn't clear, how you found the version of the script ?

* The github repo -  [millermedeiros/requirejs-plugins](https://github.com/millermedeiros/requirejs-plugins) consists of many plugins including `async` and have no `tagging` as such.
* The version number of the plugin itself is available in [`Module comments`](https://github.com/millermedeiros/requirejs-plugins/blob/master/src/async.js)
* Mentioned as `* Version: 0.1.1`
* So, I have added `async` with version `0.1.1` in `ajax/libs/require-async`
* I have also added the corresponding `package.json`

Please merge to `cdnjs` - `Google Maps` work with `requirejs` only with this plugin.