Draft integration with SimpleBuildStep.
Merge branch 'master' into BuildStep-Job

Conflicts:
	src/main/java/hudson/tasks/JavadocArchiver.java
Simplified patch to always add a JavadocBuildAction yet keep no state in it.
It will already automatically hide any link if there is no documentation to be found there.
Merge branch 'master' into BuildStep-Job

Conflicts:
	src/main/java/hudson/tasks/JavadocArchiver.java
Now targeted for 1.577.
1.577 released.
Merge pull request #2 from jenkinsci/BuildStep-Job

Workflow interoperability