Avoiding passing LogNoColors/LogColors everywhere.

Winston already have the feature (badly documented), all you have to do is:
`logger.stripColors = args.logNoColors;`

Winston stripping code: [here](https://github.com/flatiron/winston/blob/511b1a958be2354cfb6999b18f269377a3e59f0f/lib/winston/logger.js#L167)