Triple single quotes work better for most multiline strings than slashy strings.
(Dollar slashy strings are about as easy to quote, with different metacharacters, but cannot be used in a map with parentheses.)
Also strengthening test to actually run the Groovy parser the same way DSL would and check that we round-trip the object.
https://trello.com/c/4J9pauPp/154-check-multiline-syntax
Merge branch 'master' of github.com:jenkinsci/workflow-plugin