Added approval timestamp to messages and lifted restrictions on sent-to list in show view.

- As long as a member has access to view an Announcement, they should be able to see who else it went out to.
- Also fixed a minor bug with redirect.
Auto-refresh the dashboard page once every 5 minutes
Add hidden flag to shifts

All Auto-scheduled shifts are now hidden from the member view.  They will need to be published before they can be seen by regular members.
modify timestamps to be slightly more verbose (includes seconds)
update CHANGES.md
Update CHANGES.md