Require Winston logger, def configureLogging().

index.js
  -Define and integrate `configureLogging()` into `handleUserArgs()`.

package.json
  -Add `winston` logger package.
Add logging statements to dataset_import module.

lib/dataset_import.js
  -Convert `console.log()` calls to `logger.info()`.
Merge branch 'feature/logging' into develop

index.js, lib/dataset_import.js
  -Add logging to the import pipeline.