Improved comments in some of the widgets
hide cache directory
fix nits
Fix bug in launching spark from spark.
added checking for pubspec
Fix syncfs projects not synced on non-chrome os.
Merge pull request #2136 from dart-lang/fix_sync_on_mac

Fix syncfs projects not synced on non-chrome os.
Remove a false exception thrown by getPendingCommits.
Merge pull request #2138 from dart-lang/fix_bug_in_getting_commits

Remove a false exception thrown by getPendingCommits.
Merge pull request #2135 from dart-lang/spark_from_spark_launch

Fix bug in launching spark from spark.
Remove obsolete check in launch.
Merge pull request #2139 from dart-lang/refactor_launch

Remove obsolete check in launch.
Merge pull request #2132 from keertip/cache

hide 'cache' directory in files view
Implement markdown editor and preview window.
Adding header license and end of file NL
clean up content view
Adding show preview and show source
clean up button style
override reconcile
Adding missing semi