Added ability and page to sign up for activity
  Shows
    price with current user signups
    updated price IF the user signs up
    time of activity, need to update to add date

Added activity confirmation page
  Shows
    updated price after user signs up
    time of activity, need to update to add date

Added ability to delete a registration
Cleaned up the views a bit and changed the format of the date and time.
Merge pull request #2 from michaelanthonymain/activity_sign-up-confirm-drop-out

Activity sign up, confirmation and drop out