up to 1.609.1 (2015-05-29)

up to 1.609.1 (2015-05-29)

- Concurrent build limits not honored on Jenkins 1.607 (issue 27708)
- Division by zero in Executor.getProgress (issue 28115)
- Channel listener onClose propagated exceptions (issue 28062)
- Failed to instantiate class hudson.plugins.copyartifact.CopyArtifact when saving a job (issue 28011)
- Block on upstream projects does not work (issue 27871)
- Unhelpful log warning about stapler-class (issue 27918)
- 404 on jenkins.plugins.nodejs.tools.NodeJSInstaller.json.html (issue 28093)
- 1.610 "Failed to instantiate" error (issue 28110)
- NPE from LoadStatistics$LoadStatisticsSnapshot$Builder.with (issue 28384)
- Dropdowns display limited and scrollable (issue 27067)