[Runtime] Make application running with isolated storage partition

Tizen WRT spec and Chrome both require applications running with private
storage. Which means the application running data like local storage, cookies,
app cache, GPU cache will move to a standalone storage directory.

When an app is uninstalled, it is not safe to remove the corresponding
directory directly. So we will mark the uninstalled apps in DB and garbage
collect them when next time Crosswalk starts up.
Merge pull request #2006 from seanlong/isolate_storage

[Runtime] Make application running with isolated storage partition