replace colors helper for chalk, use lodash, add tests setup with mocha

Basically replaced your color helpers, with the widely adopter `chalk` lib, which makes the code easier to read and more error proof. 

Replaced underscore with lodash, due to the fact that lodash is more actively maintained, and has very good tests, plus it's just better :+1: 

Added a basic tests setup with mocha/chai. Planning on writing some tests later on, plus anyone looking to contribute will be able to write tests. Use `npm test` to run them..