Setup eslint with IDE support

[Matt Jones]

Tasks to complete:

• Setup linter to run eslint as part of a lint (or more general analysis?) script
• Decide on approach for module resolution linting. After playing with it I don't think the babel resolver is the way to go. Simplest option is to use the Node resolver which I'm thinking is the way to go.

We currently have the sku eslint config here which enables us to expose the settings to an IDE (such as Atom).