Discuss: Let author choose to stop on first failure

[plocket]

1st, author can stop tests any time and still see the report so far. They can't see the cucumber output, though. Maybe we need to print the cucumber output with each non-passing Scenario.

2nd, we need to research if cucumber can do this.

3rd, is it possible (and do we want to) stop on status "undefined", etc., or just on "failed"?