Adding ability to mark a job successful in order to trigger off dependent children

[Califax]

I opened a PR for this at #595

The idea is I want to be able to trigger all the dependent children jobs that depend on a successful invocation of a base job without actually running the base job itself. I update the success count and last success and errorCountsSinceLastSuccess on the specified based job and I use processDependencies to determine what children jobs should be triggered to run. I've run into cases with batch jobs where it is easier to fix one job within the batch, run it outside of chronos, then mark the dependency complete over rerunning the entire batch job in a long dependency. I have other use cases as well. Let me know what you think.

[ddossot]

This is a great addition, definitely something that's needed.