fix: AppleAuthProvider.java missing semicolon

ISSUE-56 [MINOR] add onDisconnect database api for android & ios

ISSUE-48 [MINOR] apple sign in

ISSUE-51 support for multiple databases Android + iOS

ISSUE-51 support for multiple databases Android + iOS

ISSUE-50 .travis.yml define all stages

ISSUE-40 fix robovm google sign in

ISSUE-40 robovm backend

ISSUE-44 firebase crashlytics support for android

ISSUE-44 firebase crashlytics support for android