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This adds accessibility events for navigating the views in Calendar.
-Moving times in Day/Week view says the time and any overlapping
events.
-Switching between events in the same time slot says the event.
-Opening an event popup reads the event.
-Opening edit event reads the event.
-Opening an event in search reads the event.

Fixed a bug in month view that caused a crash.

Change-Id: I734b43597fbdf76cbf693374ac8585645fab94fe