🍕 feat: Adds SB ESLint rules

[dflynn15]

• Adds SB ESlint plugin and dependencies for local run
• Adds lint task
• Makes code changes for linting errors
• Ref add sparkbox-eslint #4

[asimpson]

Let's also add an eslint for specs:

e.g.

{
    "env": {
      "mocha": true
    },
    "rules": {
      "no-unused-expressions": 0
    }
}