Upd: utils: Added isNull; isDefined checks only typeof !== undefined
Using only the subobject _db_ from the whole config.
[server_user]

Upd: userapi: Added Model.changeUserProperty
---> Added user.changeProperty (Replaced changeEmail, changePassword)
---> Added Model.sendUserLockedNotificationMail
---> Update user.sendLockedNotificationMail
---> Added Model.sendUserPasswordResetMail
---> Added user.sendPasswordResetMail
---> Exporting _#getLockTime_
---> Renamed: _#getAuthenticated_ -> _#getAuthenticatedUser_
---> Added a new reason called _LOCKED_
Unit: userapi: Updated due to the changes in the api.