WIP - Initial implementation

This is a first implementation, still a work in progress. Some refactoring still needs to happen!

**FEATURES:**
* Programmatically Lint Css file
* Programmatically Lint Js file

**TODO:**
* Rake tasks
* Refactor error messages parsers
* Refactor error message formatters 
* Add Factories to ```Linter``` class instead of ``case when``` statements