Aded Data Helper and Session Helper

These are two objects I find myself using a lot. I feel like the Class Name "Data" might be a bit too generic and would advise an alternate name, nothing came to mind right away.
Session::refresh() allows a users to regenerate a session_id and optionally delete all session data. I've never used it personally. Though I could imagine using it when storing sessions in a database as a way to avoid session_id spoofing, by occasionally updating the session_id instead of having a long lived session id.