iOS 9 setup instructions
iOS 9 setup instructions

closes #34

lwhiteley/react-native-facebook-login,brysgo/react-native-facebook-login,leonacky/react-native-facebook-login,brysgo/react-native-facebook-login,lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,lwhiteley/react-native-facebook-login,leonacky/react-native-facebook-login,brysgo/react-native-facebook-login