Improve error message legibility on Windows

On Windows the blue message colour is difficult to read:
![jscs-before](https://cloud.githubusercontent.com/assets/2017615/5129517/ee551a7a-70da-11e4-96b1-aded67326cf5.PNG)

Changing the colour to cyan improves the legibility:
![jscs-after](https://cloud.githubusercontent.com/assets/2017615/5129557/54145dd0-70db-11e4-8f74-bde075e40025.PNG)

Based on the solution used by [jshint-stylish](https://github.com/sindresorhus/jshint-stylish/blob/9c3f1c543788825b27783598260bf16d94fe9bf6/stylish.js#L31).