Add Pod paths to header search paths

By adding the pod paths, we ensure that if dependencies (namely React) are installed *only* via Pod and not via direct linking in the project.

Dispatch setApplicationIconBadgeNumber on main thread to prevent runtime warnings

Fix cocoapods react-native-fcm 11

fix pod install typo

This Requires cocoapods 1.4 to run
sudo gem install cocoapods --pre

fix fail notification schedule after reboot on Android

Update README about Android Configuration