Add eslint support

[cereallarceny]

We need help adding ESLint to syft.js so that we can more readily detect style issues in our code. Ideally, all configs would be set to error so that we have failing tests until the code is properly written.

This issue is a bit non-descript, so if you're interested in helping configuring ESLint properly, please contact me (@cereallarceny) on Slack and I'll get you started!

[cereallarceny]

Ideally we would use eslint: recommended with the strict rule set to ['error', 'never'].

[ghost]

hi, i'd like to try this

[cereallarceny]

Alright @robertbegna! It's yours. Hit me up in Slack if you have questions. I'm happy to assist. :)