Added requestStateForRegion to LocationMananger.js

Added requestStateForRegion to LocationMananger.js for requesting the current state of a region at any given point. requestStateForRegion is part of the official API ([CoreLocation API on requestStateForRegion](https://developer.apple.com/library/ios/documentation/CoreLocation/Reference/CLLocationManager_Class/index.html#//apple_ref/occ/instm/CLLocationManager/requestStateForRegion:))

I'm one of those who have problems with didEnterRegion and didExitRegion not being sent on app starting up in background mode. Using this I can get around it, and even make a more idempotent setup, not relying on to many events.