tweaks to the outline view
merge to master; fix outline tests
Removed an unnecessary call
Add support to add a folder to git add.
Support git add on folders.
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
call fewer ace methods
Do not override explicitly specified primary/raised/flat based on submit/dismiss/cancel
Reformat button instantiations to be more compact
Fix NPE in askUserOkCancel()
Fix typos
Merge remote-tracking branch 'origin/spark-dialog-2' into spark-dialog-3
Add folders to git index.
Create and  update folder status.
Fetch and folder status from scm optimized.
Show folder status in files view.