Dashboard now used column charts instead of pie chart so that it can
    give an overview of all product versions that are included in the quality
    report.
Remove ART performance metric. Not used anymore.
Dashboard now used column charts instead of pie chart so that it can
    give an overview of all product versions that are included in the quality
    report.
Refactoring.
Bug fix: ignore revisions created by Maven on tags when checking for
    unmerged revisions of branches.
Bug fix: don't invoke the Sonar runner on products without Sonar id.
Prepare for release.