Refactor git_salt.
change laod path.
Recompile.
Add link to mailing list.
Merge pull request #3688 from rpaquay/add-mailing-list-link

Add link to mailing list.
Move flags from app.json to spark_flags.dart.
Remove app.json.
Update comment.
Update grind script to use user.json instead of app.json.
catch file not found exception in grind script.
fix exception.
nit.
.
fix indent.
Merge pull request #3689 from dart-lang/fix_flags

Define spark_flags statically.
Merge pull request #3686 from dart-lang/refactor-git-salt

Refactor git salt
Merge pull request #3690 from ussuri/bower-improve-stability

Bower: handle moved repos, improve stability & messaging