build(eslint) add eslint plugins for node and mocha

[sverweij]

These plugins flag common mistakes in node and mocha use

How Has This Been Tested?

npm run lint

Types of changes

• Bug fix (non-breaking change which fixes an issue)

Checklist:

• The code I add will be subject to The MIT license, and I'm OK with that.
• The code I've added is my own original work.
• My code follows the code style of this project.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.