Merge branch 'fix-polymer-ui-menu' of https://github.com/ussuri/spark into sergey_menus
Added notion of modal dialogs
Merge branch 'master' of https://github.com/dart-lang/spark into sergey_menus
Cleanup
cleanup
merged
Fixed listener's not being removed.
cleanup
Merge pull request #517 from dart-lang/sergey_menus

Sergey menus