Facebook Android SDK 3.6.0

Summary:
Modified
+ AppEventsLogger is now out of Beta, setLimitEventUsage is deprecated and moved to Settings as setLimitEventAndDataUsage

Added
+ Added setSelection methods on FriendPickerFragment to allow pre-selection of friends.
+ Added example use of setSelection API in Friend Picker Sample
+ Added support for Gradle.

Fixed
+ Fixed bug in WebDialogs where the dialog would not display properly for large displays with soft keyboards
+ Fixed bug where the callback for NewPermissionsRequest was not called
+ Fixed bug in AuthorizationClient where it can hang on orientation changes

Test Plan: Tested on emulator

Reviewers: clang

Reviewed By: clang

CC: platform-diffs@lists

Differential Revision: https://phabricator.fb.com/D1089971
Merge branch 'master' of https://github.com/andrewchae/facebook-android-sdk

# By Andrew Chae (4) and others
* 'master' of https://github.com/andrewchae/facebook-android-sdk:
  Raised project.properties target to 19
  updated build.gradle for libraries
  Raised gradle version to 0.6+
  Updated .gitignore
  Removed .idea files
  Updated Android Studio project file
  Updated to use gradle

Conflicts:
	facebook/build.gradle