User can't logout when database has been changed

[egel]

When using CMS, I few time changed the DB. Then I've noticed that CMS can't properly handle of logging out user when DB has changed.

[egel]

I think that the problem hides into the logout method. It did not clear the $localStorage data at all.

[egel]

Probably this issue strongloop/loopback#720 is the main problem of successfully logging out method.