Android 2.1 - Fixed NullpointerException when request timeout while dowloading image.
Android 2.1 - Fixed NullpointerException when request timeout while downloading an image.
Android 2.1 - Fixed NullpointerException when request timeout while downloading an image.
Merge pull request #391 from CristianOliveiraDaRosa/dev

Android 2.1 - Fixed NullpointerException when request timeout while downl...
Add maven central to main library

See #383 for details.
Merge pull request #393 from almozavr/patch-2

Add maven central to main library
Facebook Android SDK 3.20
Facebook Android SDK 3.20

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

Upgrading:
    https://developers.facebook.com/docs/android/upgrading/