[JENKINS-21072] White screen after submitting job generation
[maven-release-plugin] prepare release jobgenerator-1.20
[maven-release-plugin] prepare for next development iteration
[JENKINS-21238] Ability to run the generated job immediately after generation
[maven-release-plugin] prepare release jobgenerator-1.21
[maven-release-plugin] prepare for next development iteration
Merge pull request #19 from jenkinsci/master

v1.21