If you share calendars among friends, family members, and co-workers, you may have sometimes found yourself in the annoying situation of having their reminders go off on your iPhone. Fortunately, the iOS 8 Calendar app now allows you to turn off notifications on a per-calendar basis. To do this, simply go into the Calendar app, tap the “Calendars” button in the bottom center to bring up your list of Calendars, and then tap the red “i”…