ci: Add eslint-config, use only .travis.yml

[oleg-koval]

Motivation

Fixes #29

Changes

• use eslint, eslint-config-sexy rules
• get rid of makefile, use .travis.yml instead

[oleg-koval]

@sjmcdowall
This is the initial push for new eslint rules, you can check all errors/warnings
After that, I 'll fix them all

What is confusing me is that snyk report, as we already have all vulnerabilities fixed with npm audit

[oleg-koval]

also, we need to combine somehow this pr with other pr #30, maybe with the third branch?

[sjmcdowall]

Is there a way to get the details of the synk errors? I'm not even sure how that pooch works..

Also, what's with the travis-ci failure? Do all those lint errors need to be fixed before we Merge?

I think the things it flagged are spot on.. no issues with those!

[oleg-koval]

@sjmcdowall

• travis-ci shows what we need to fix regarding styling issues
• snyk is minor problem, we can get to it later

[oleg-koval]

I would suggest merging #30 first, and then rebase this branch on master and fix all style stuff

[sjmcdowall]

#30 merged..

[oleg-koval]

@sjmcdowall
Looks like all fixed now finally :)

[sjmcdowall]

Nice!!