1731 Update plugin Dart code to conform to current Dart formatter (cla: yes)

1733 [firebase_core] Automate version retrieval (cla: yes)

1734 [google_maps_flutter] ios build fix (cla: yes)

1735 Remove hard coded version check (cla: yes)

1737 [google_maps_flutter] Allow BitmapDescriptor scaling override (cla: yes)

1738 Update API link (cla: yes)

1739 [firebase_crashlytics] Fix parsing stacktrace (cla: yes)

1742 [firebase_core] roll back to 0.4.0+3 (cla: yes)

1744 [image_picker] return error in the event that permissions are not granted (cla: yes, submit queue)