iOS 8 Contact Picker selection fix

This fixes the issue in iOS 8 where the iOS contact overlay after
getting invoked and when the user selects the desired contact, control
doesn’t return back to the phone gap app.

Source:
http://stackoverflow.com/questions/25806774/abpeoplepickernavigationcont
roller-changes-with-ios8
Merge pull request #15 from joeljesudossu/master

iOS 8 Contact Picker selection fix