Added shortcut is_cached method to Navigation instances and Navigation.objects; updated other methods to use these shortcuts. Added cache clearing for new and changed Navigation instances that have not been cached but are within the range of a hosted navigation instance.
Added shortcut is_cached method to Navigation instances and Navigation.objects; updated other methods to use these shortcuts. Added cache clearing for new and changed Navigation instances that have not been cached but are within the range of a hosted navigation instance.

ithinksw/philo,ithinksw/philo