Facebook iOS SDK 3.5.2

Summary:
     Bug fixes. See https://developers.facebook.com/ios/change-log-3.x/

Reviewed By: jacl

Test Plan: Release Testing.
Facebook iOS SDK 3.5.3

Summary:
     Bug fixes. See https://developers.facebook.com/ios/change-log-3.x/

Reviewed By: jacl

Test Plan: Release Testing.

@update-submodule: vendor/OCMock
Merge github.com:facebook/facebook-ios-sdk version 3.5.3