Consider using NativeEventEmitter instead of DeviceEventEmitter

[cristianoccazinsp]

Any reason DeviceEventEmitter is being used? I've been testing using the recommended NativeEventEmitter and it seems to work fine. https://facebook.github.io/react-native/docs/native-modules-ios#sending-events-to-javascript

Might also want to consider the following optimization from the docs: https://facebook.github.io/react-native/docs/native-modules-ios#optimizing-for-zero-listeners

[pribeh]

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