[WIP]tools: simply eslint tasks

This is subtask of https://github.com/nodejs/node/issues/25908.

Main Changes made

• delete all tools/node_modules/eslint, tools/node_modules/babel-eslint
• create package.json with lint task
• rewrite Makefile and vcbuild.bat
• related change to .eslintrc.js and tools/lint-js.js

Process

• I tested on windows using .\vcbuild.bat nobuild lint-js, not tested on linux
• npm install looks like failed, not sure why. Though on windows the task still works. Failed log see https://travis-ci.org/gengjiawen/node/jobs/492161168.

I am not fluent in bash or bat, nor familiar with the whole lint process. Any help would be very welcome.

cc @trott @refack @joyeecheung

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• commit message follows commit guidelines