time handling for event_time, start_time and end_time is working better now.  But needs test for over midnight events.
Some small changes to scrum index page to prevent crashes... I wasn't sure how to handle the check-in for those changes.. but they should have gone into a separate check-in. (oops)
implemented only show active events... I'm not sure if I included a test for this. Added expired? method for this functionality.
Cleaned up the views, especially if the user isn't logged in then he can't join an event or start or edit (no actions)