tweaks to the outline view
merge to master; fix outline tests
Initial version of spark-dialog

More-or-less works but is badly stiled (turned off Bootstrap)
Initial version of spark-dialog-button
Change default style to flat
Standardize overlay toggling attribute name ('overlay-toggle' -> 'overlayToggle')

Didn't change the usage in spark_polymer_ui.html, since that's going to be all rewritten.
Use spark-dialog & spark-dialog-button instead of spark-modal & spark-button in UI
Do not override explicitly specified primary/raised/flat based on submit/dismiss/cancel
Reformat button instantiations to be more compact
Fix NPE in askUserOkCancel()
set chrome 35 to be our min version
Fix typos
Merge remote-tracking branch 'origin/spark-dialog-2' into spark-dialog-3
Minor cleanup of spark-overlay
Don't wait for syncFs to load.
Merge pull request #2174 from dart-lang/fix_sync

Don't wait for syncFs to load.
Additional cleanups
Merge remote-tracking branch 'origin/master' into spark-dialog-3
Remove Bootstrap imports spark_polymer.css/spark_polymer_ui.css - imported through spark_common.css
Remove Bootstrap import from spark-menu - it's not using it