Add Pleeease Filters to examples
Allow to use ES6 code
Rewrite tests from CoffeeScript to ES6
Fix comma
Remove deprecated options support
Convert SyntaxError to ES6
Convert vendor to ES6
Convert list to ES6
Convert Result to ES6
Convert Comment to ES6
Convert Raw to ES6
Convert postcss to ES6
Convert Root to ES6
Convert PreviousMap to ES6