ADD: option to go to a specific step

[winternet-studio]

Sorry, I don't know how it works with all your tools in the repository which I assume do something for building and testing etc. So I just committed changes directly to the build.

[StefanBrandt]

I'am new with this extension. But this is what I searching for.

Also I'am looking for an method to "reset" the complete steps. There is only a destroy method but this is not so good. I will rest all steps and then go back to the first step.

[tsauerwein]

I also would love to see this method in the lib!