flexible publish
cleanup
fixed XML escapting for attribute values
Merge branch 'flexible_publish'

Conflicts:
	docs/Home.md
	docs/Job-reference.md
	job-dsl-core/src/test/groovy/javaposse/jobdsl/dsl/helpers/publisher/PublisherHelperSpec.groovy
Merge pull request #297 from CoreMedia/gradle-jpi-plugin

update to gradle-jpi-plugin 0.6.0
increased core version to 1.509.3