pm_f749ede9-44ea-4fad-a959-a489bf31bb30
From dart2js branch
Built out interface for impl
Maintaining ping functionality
Moved ActionEvent into its own class
Services updated interface per architecture proposal.
Updated ActionEvent to include response bool
Merge branch 'master' of https://github.com/dart-lang/spark into umop-services-interface
Merge branch 'master' of https://github.com/dart-lang/spark into umop-services-interface
review fixes
Moved actionevent to utils and renamed to more specialized ServiceActionEvent
Restored ping / pong.
Finished re-implementing ping / pong
Merge pull request #1015 from umop/umop-services-interface

Services empty interface only.