integrate and use ESLint and JSCS

[deepsweet]

ESLint:

ESLint is a tool for identifying and reporting on patterns found in ECMAScript/JavaScript code. In many ways, it is similar to JSLint and JSHint with a few exceptions

JSCS:

jscs is a code style checker. You can configure jscs for your project in detail using over 60 validation rules, including presets from popular style guides like jQuery.

I can help you with it, but you should define your codestyle and express it with .eslint and .jscsrc.

[ProgerXP]

I really appreciate this hinting, thanks @deepsweet. I have added ESLint config in 98525b6.

[deepsweet]

👍