FirebaseUI for Android v2.1.0

FirebaseUI for Android v2.1.0 contains a number of new features and bug fixes:

• All authentication flows are now translated into dozes of languages!
• Support for night mode.
• List adapters no longer need an Activity reference.
• Better error messages when developing Phone Authentication.
• Large internal refactor.
• Fix crash #780

This version has the following notable transitive dependencies:

Dependency	Version
Firebase / Play services	11.0.2
Support Library	25.4.0