Firebase Native Phone Auth

Adds support for Native Firebase Phone Number authentication to your Cordova or PhoneGap apps.

** THIS PLUGIN IS UNFINISHED, USE THE FOLLOWING INSTEAD: **

#Android: https://github.com/apptum/cordova-plugin-firebase#verifyphonenumber-android-only

#iOS: https://github.com/silverio/cordova-plugin-firebase