Add linting scripts for use in CI

[caesarsol]

emulate this:

"scripts": {
    "lint": "node node_modules/eslint/bin/eslint.js src/",
    "lint:errors": "node node_modules/eslint/bin/eslint.js --quiet src/"
}

[markov00]

• Add lint only at pre-commit

• Add lint only on diff files

[marcofugaro]

pre-commit examples

https://github.com/vuejs/vue/blob/v2.2.2/build/git-hooks/pre-commit

https://github.com/facebook/react/blob/master/scripts/git/pre-commit

What CRA does:
facebook/create-react-app#2729

[marcofugaro]

Added lint command in 8b82128 which lints only changed files in src/ folder.

Sould we also add the (removable) hooks on pre-commit which prevents commiting if there are any warnings? Using husky

What do you say @accurat/developers?

[marcofugaro]

Closed in #40 .

Linting in pre-commit seems too strict. If someone wishes to, he can enable it per project using husky