Facebook Android SDK 3.19.1

Summary:
    see https://developers.facebook.com/android/change-log-3.x/

Upgrading:
    https://developers.facebook.com/docs/android/upgrading/
Fix resource leak issue of cursor

Unclose cursor exists.
Rework of previous fixing.

Rework of previous fixing.
Merge pull request #395 from cloudrick/Rick's-local

Fix resource leak issue for cursors.