Rewrite v1

• uses executeTransactionAsync() on the UI thread
• uses initialData() to prepopulate the Realm
• uses RealmManager class (a bit stub-like because I'll have to make its content not static later) to manage number of open activities
• uses retained fragment to count open activity
• uses retained fragment to store presenter (oh, it actually has a "presenter" instead of just throwing everything in OnClickListeners)
• does not use Application subclass explicitly because of Firebase Crash Reporting for example creating multiple Application instances
• uses RealmRecyclerViewAdapter with asynchronous query