Just return the className. The old code didn't work with activity aliases. For example, when launching with `<activity-alias android:name=".SplashActivity" android:targetActivity=".MainActivity" />`, the old code would try to get the class for `SplashActivity` which threw `ClassNotFoundException`.

Update README.md

Fix call to setApplicationIconBadgeNumber

added big picture style to android notification

Recommend staying on iOS SDK v3

Provide collapse_key, from, mesage_id, and send_time in foreground notificaitons

doc(readme) : add missing settings

Update README.md

Update READ.ME with correct diff for dependencies

by just adding a key called picture to  the notification payload, we can
display image on android notification.