fireData - Connect to 'Google Firebase'

Provides an interface to 'Google Firebase' services <https://firebase.google.com/>, including 'Firebase Realtime Database', 'Cloud Firestore', 'Firebase Authentication', and 'Cloud Storage for Firebase'. Supports interactive use and 'shiny' applications as well as automated server-side workflows. Data frames and objects can be stored and retrieved, users can be authenticated, and files can be managed through the services' application programming interfaces.