JS Preprocessor (In Progress)

As a preview, there is my branch on the JS Preprocessors.

- CoffeeScript
  - [x] CoffeeScript version of the app
  - [x] CoffeeScript build
  - [x] CoffeeLint
  - [x] Tests
- ES6
  - [x] ES6 version of the app
  - [x] Traceur build
  - [x] 6to5 build
  - [x] Module handling with Browserify
  - [x] Tests
- TypeScript
  - [x] TypeScript version of the app
  - [x] TypeScript build
  - [x] Tests
Option `--default` will use '6to5' ?