slightly refactored 'list-plugins' output formatting code to be more groovy
slightly refactored 'list-plugins' output formatting code to be more groovy

git-svn-id: 29aad96320b2a07b98332cd568fc1316025c072f@4804 1cfb16fd-6d17-0410-8ff1-b7e8e1e2867d

jeffbrown/grailsnolib,jeffbrown/grailsnolib