Pull Request: Choose status which abort the flow build

[ueberhammDesign]

Reopen Pull-Request #59 to squash all together and resolve merge problems.
Original Message:

You can choose the status (Success, Unstable or Failure), which abort the flow build. It also contains, that the build can not be 'better' than any build inside the flow build.

[jenkinsadmin]

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[dnozay]

please refactor, I think you only need one method runWithAbortWhenWorseThan { script, abortWhenWorseThan -> ... }

[ueberhammDesign]

New testcases added.

[dnozay]

@ueberhammDesign

Since I am currently looking for someone else to take over as a maintainer; I will not be the one merging this change. Please check http://jenkins-ci.org/pull-request-greeting.

Side note: I think introducing new features in this plugin is risky and takes away resources that could be better spent on the pipeline plugin. However, please feel free to merge if you are interested in carrying on the flag.

I did look at your changes though, and thank you for addressing my earlier concerns.