Future Android tutorial topics

[X] Cross platform web requests, github.com/square/retrofit
[ ] Using interfaces to inject per platform functionality to core module (saving and loading fortune file)
[ ] Cross platform Data table UI (showing / editing saved fortunes)
[ ] Event Bus, gitthub.com/square/otto, to decouple events from UI updates
[ ] Lifecycle considerations, especially with async tasks
[ ] Switch to using lambdas, show how to use retrolambda on Android.

robovm / robovm-docs