Upgrade step definitions to cucumber 2 format

cucumber-js version 2 is out as stable version

there is an updated steps definition format

docs:
https://github.com/cucumber/cucumber-js/blob/master/docs/nodejs_example.md

examples:
https://stackoverflow.com/questions/42917326/protractor-config-file-is-not-picking-up-the-cucumber-step-definitions

would be good to upgrade this repo. any plans on this?