iOS 8 fix (depreciated method)

Updated for iOS 8

Disclaimer:
I'm a web developer first & foremost (no experience with obj-c).  I was able to mess around for a bit and make this work.

- see depreciated statements
https://developer.apple.com/library/ios/documentation/AddressBookUI/Reference/ABPeoplePickerNavigationControllerDelegate_Protocol/index.html#//apple_ref/occ/intfm/ABPeoplePickerNavigationControllerDelegate/peoplePickerNavigationController:shouldContinueAfterSelectingPerson:property:identifier: