add js preprocessor prompts and first implementation with coffee
allow mixing js and jsPreprocessor extension
add es6 version and 6to5 option
traceur compiler
fix and add tests for coffee and es6
add coffeelint
typescript
fix test-options
pass default to no js preprocessor, upgrade a little the tests
Merge pull request #175 from Swiip/jsPreprocessor

Add JS Preprocessor(CoffeeScript, Traceur, 6To5, TypeScript)