Added Raptor Templates

For more information on Raptor Templates:

Raptor Templates is an extensible, streaming, asynchronous, high performance, HTML-based templating language that can be used in Node.js or in the browser. Raptor Templates was founded on the philosophy that an HTML-based templating language is more natural and intuitive for generating HTML.

* [Github project page](https://github.com/raptorjs3/raptor-templates)
* [npm page](https://www.npmjs.org/package/raptor-templates)
* [Benchmarks](https://github.com/raptorjs3/templating-benchmarks)

Additional Reading:

* [Announcing the New Raptor Templates](http://psteeleidem.com/announcing-raptor-templates/)
* [Raptor Templates versus Dust](http://psteeleidem.com/raptor-templates-versus-dust/)
* [The JavaScript Templating Landscape](http://psteeleidem.com/the-javascript-templating-landscape/)