Usage:
npm i --save-dev postcss postcss-import enb-postcssnodeConfig.addTech(
[require('enb-postcss/techs/enb-postcss'), {
comments : true,
sourcemap : true,
plugins : [require('cssnext')()],
oneOfSourceSuffixes : [['post.css', 'css'], ['ie.post.css', 'ie.css']] // keep just one of found tech. Default is undefined
} ],
);