Add different preprocessors

[welldan97]

templates:

• atpl
• doT.js
• dust
• dustjs-linkedin
• eco
• ect
• ejs
• haml
• haml-coffee
• hamlet
• handlebars
• hogan
• htmling
• jade
• jazz
• jqtpl
• JUST
• liquor
• lodash
• mote
• mustache
• nunjucks
• QEJS
• ractive
• react
• slm
• swig
• templayed
• twig
• liquid
• toffee
• underscore
• vash
• walrus
• whiskers
• coffeekup?

Lightweight markup languages:

• markdown
• other?

js:

• coffeescript
• typescript
• clojurescript
• purescript
• es6/babel?
• dart

css:

• sass
• scss
• stylus
• less
• be aware of sss