Added spinner css to polymer spark
restore new file/folder context menu options
Merge pull request #622 from dart-lang/keertip_context_menu

restore new file/folder context menu options
Merge pull request #615 from dart-lang/spinner-polymer

Added spinner css to polymer spark
Merge branch 'master' of https://github.com/dart-lang/spark
Merge branch 'master' into devoncarew_splitter_fix
fixed issues w/ restoring the splitter location