add support for --world-parameters

[ermakovich]

resolves #44

[andreasmarkussen]

@vgamula is there any progression on this?
It looks great!

I would also consider adding a dry-run option as well.
But that is another PR.

If there is no interrest in maintaining this, let me know. I would be happy to take over, and make a github.com/gulp-cucumber/gulp-cucumber repo that I would maintain so that @ermakovich s change could be added.

[andreasmarkussen]

@ermakovich - perhaps it would be cool, if you could add a scenario where you could show how this works!
It is a cucumber repo, so we do take our own medicine! :)