Add SparkJobStatus class.
Return SparkJobStatus for jobs.
Make all jobs return a SparkJobStatus.
Return SparkJobStatus from job scheduler.
Add status to more jobs.
Return value of future in polymer wrapper for openFOlder.
nits.
Merge branch 'master' into git_stash

Conflicts:
	ide/app/spark.dart
Addressed comments.
Move status class to jobs.dart.
I/O videos
Improve Chrome App template.

- Indent consistently.
- Style changes to text.
- Add short_name to manifest.
- Fill out description field in manifest.
- Remove superfluous minimum_chrome_version from manifest.
- Make the DOM manipulation in main.js more obvious.
- Wrap main.js functionality in onload.
Merge pull request #2728 from sowbug/master

Improve Chrome App template.
add yaml, go, editors; change session customizations
upgrade polymer deps to capture a fix to a polymer expressions issue
Merge pull request #2732 from devoncarew/devoncarew_upgrade_polymer

upgrade polymer deps to capture a fix to a polymer expressions issue
Merge branch 'master' into devoncarew_editor_types
tweaks
fixed checked mode exceptions
fix an issue with navigation in the files view