1.0.0-alpha.31

Implement client-side Firebase Cloud Functions locations (#23)

* Implement client-side Firebase Cloud Functions locations

Allows client-side Functions calls to remote functions using a supported 
Region (Android & iOS) or Custom Domain (iOS only).

See 
https://firebase.google.com/docs/functions/locations#client-side_location_selection_for_callable_functions

Adds a method to FirebaseApp ('functions') to set Region or 
CustomDomain. 

Example usage: firebase().app().functions("europe-west")

See 
https://firebase.google.com/docs/reference/node/firebase.app.App#functions

Example client-side call:
firebase().functions().httpsCallable('functionName')()
calls Cloud Function:
exports functionName = functions.region('europe-west1')...
See 
https://firebase.google.com/docs/functions/locations#best_practices_for_changing_region

Supported regions: See 
https://firebase.google.com/docs/functions/locations

By default functions run in the "us-central1" region, unless another 
region is selected.

Android Functions Emulator: Set 'localhost' host to 10.0.2.2

* Update README.md file with usage instructions

* Update README.md file with usage instructions

* Clenaup README.md text

1.0.0-alpha.30

chore: bump

1.0.0-alpha.29

chore: bump

1.0.0-alpha.28

feat: custom auth providers

fixes : #28
fixes: #27

1.0.0-alpha.25

chore: bump

1.0.0-alpha.24

chore(storage): update demo

1.0.0-alpha.23

chore: bump

1.0.0-alpha.22

chore: bump

1.0.0-alpha.21

fix(messaging): make service bootaware

1.0.0-alpha.20

chore(core): remove log