Release Firestore 2.0.7 and Storage 2.0.3

Release Crashlytics 2.0.3 and Bundled 2.0.12

Release Auth 2.0.6, Crashlytics 2.0.2 and Bundled 2.0.10

Bump up Xamarin.Firebase.Auth to 122.2.0 (issue TobiasBuchholz#131)

Release Analytics 2.0.2, CloudMessaging 2.0.4 and Bundled 2.0.8

Bump up version of native android packages for firestore, functions a…

…nd storage

Release Auth 2.0.4, Auth.Google 2.0.0, Firestore 2.0.4, Bundled 2.0.6

Merge branch 'development'

Release Auth 2.0.3, Firestore 2.0.3 and Bundled 2.0.4

Add release notes to docs