removed remaining i18n stuff
don't raise exception if permission_session isn't found in db.

This will happen if the db is reloaded while there are users logged in.
 An even better solution would be to automatically log  them out, but
this at least leaves a user logged in with no permissions (so the
user can log out and log in again)
example object type which works with global permissions only

access to GlobalResource objects are controlled at the global level only.
This means the model is not integrated with PermissionedObject, but
controller actions check for global permissions on the resource type.
    example permissioned object type which is not involved in an inheritance relationship
a couple bug fixes w/ PermissionedObject that were exposed by using a real permissioned object type
added example object types with permission inheritance
Add spec tests for object-level permissions