Support cucumber's dry-run mode

[simondean]

Cucumber has a dry run mode where it will run through all the features/scenarios and tags that have been specified on the command line without actually executing any of the steps. This allows you to, for example, output the Cucumber JSON report showing all the scenarios and steps that would have been run without having to actually execute any of the scenarios.

[simondean]

I'm going to leave the issue open until cucumber-js supports dry runs. See cucumber/cucumber-js#128