Prevent mass-assignment when adding/updating a forum (#10390).
Set user_id as a protected attribute (#10390).
Prevent mass-assignment when adding/updating a wiki (#10390).
Prevent mass-assignment when adding/updating a version (#10390).
Prevent mass-assignment when adding/updating a time entry (#10390).
Use safe_attributes= just like in #create.
Prevent mass-assignment when adding/updating a news (#10390).
Prevent mass-assignment when adding/updating a forum message (#10390).
Prevent mass-assignment when adding a project member (#10390).
Prevent mass-assignment when adding/updating an issue category (#10390).
