AppLifecycleMiddleware

This is a SwiftRex Middleware that specializes in transforming application lifecycle notification to Redux actions.

The original code was pulled from @luizmb's code and extracted to avoid copying it over and over. In addition the code was refactored to allow to mock some of the notifications provided by the NotificationCenter (via dependency injection).

Current features

We currently support the following notifications :

• didBecomeActiveNotification
• willResignActiveNotification
• didEnterBackgroundNotification
• willEnterForegroundNotification

Future enhancements

Looking at supporting those additional notifications :

• willTerminateNotification