Facebook Android SDK 3.18.1

Summary: Facebook Android SDK 3.18.1 (see https://developers.facebook.com/docs/android/change-log-3.x/)

Test Plan: Built ZIP

Reviewers: clang, gokhanc, gen

Reviewed By: gen

Subscribers: dmmiller

Differential Revision: https://phabricator.fb.com/D1578814
Facebook Android SDK 3.19

Summary: Facebook Android SDK 3.19 (see https://developers.facebook.com/docs/android/change-log-3.x/)

Test Plan: Built ZIP

Reviewers: gokhanc, chrisp, gen, toddkrabach

Reviewed By: toddkrabach

Subscribers: subodh, dmmiller

Differential Revision: https://phabricator.fb.com/D1592127
Facebook Android SDK 3.19.1
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/
Facebook Android SDK 3.19.1
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
Fix resource leak issue of cursor

Unclose cursor exists.
Rework of previous fixing.

Rework of previous fixing.
Facebook Android SDK 3.20
Facebook Android SDK 3.20
Merge pull request #395 from cloudrick/Rick's-local

Fix resource leak issue for cursors.
Dead code elimination FacebookDialog.java

I wish that I could be of help to you, but... :put_litter_in_its_place:
Merge pull request #399 from srea/dev

Dead code elimination FacebookDialog.java
Support ContextWrapper objs with LoginButton.

This particular change enables support for Mortar-based apps, which
render views using a context wrapper.
Merge pull request #401 from stevenle/dev

Support ContextWrapper objs with LoginButton.