Added Raptor Templates

[patrick-steele-idem]

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
• npm page
• Benchmarks

Additional Reading:

• Announcing the New Raptor Templates
• Raptor Templates versus Dust
• The JavaScript Templating Landscape

[garann]

Thanks for the contribution! However, I'm not maintaining this project anymore (more on why in the readme). Leaving this PR open so it's easily visible to anyone who might want to fork the project and update the criteria and template engines included.